Every English student has lost marks over these expressions. Today that stops.
Why These Expressions(Until, till, by, within, up to, till now, till then, up until now, latest by) Confuse Even Fluent Speakers
You know the feeling. The sentence is almost perfect — and then you hit a wall. Do I write “until Monday” or “by Monday”? Is “till now” correct or should it be “up until now”? And is it “upto” or “up to”?
These are not small doubts. These expressions change deadlines, shift meanings, and in professional or academic writing, one wrong choice signals weak grammar instantly.
The confusion is real because all these expressions deal with time — but each one handles time differently. This guide cuts through every overlapping meaning and gives you clean, usable rules with examples you will recognise from real life.
1. UNTIL — Continuous Action Up to a Point
Meaning: Something continues without stopping right up to a specific moment — and then it stops.
Structure: Action + until + endpoint
Examples:
- Study hard until the exam begins. (Keep studying — stop only when the exam starts.)
- She waited until the last bus left. (Waiting continued non-stop up to that moment.)
- The office stays open until 6 p.m. (Open continuously — closes at exactly 6.)
The key signal: A continuous action that runs up to a boundary.
2. TILL — The Informal Twin of Until
Meaning: Identical in meaning to until — but used in informal, spoken, and everyday writing.
Structure: Identical to until — action + till + endpoint
Examples:
- Wait till I get back. (Informal — perfectly natural in conversation.)
- He did not sleep till midnight. (Casual written English — blogs, messages, stories.)
- They played till the sun went down. (Natural, relaxed narrative tone.)
The key signal: Use till in conversation and informal writing. Use until in essays, formal emails, and academic work. Both are grammatically correct — register is the only difference.
3. BY — A Deadline, Not a Duration
Meaning: Something must be completed at some point before or exactly at a specific time. The action does not need to continue — it just needs to be done.
Structure: Task + by + deadline
Examples:
- Submit your assignment by Friday. (Anytime before or on Friday — the process is not continuous.)
- She had left by the time we arrived. (She left at some point before we arrived.)
- Please confirm by 5 p.m. (Confirmation must happen before 5 p.m. — exact time does not matter as long as it is done.)
The key signal: By is about a deadline. Until is about duration. This is the single most important distinction in this entire article.
Quick contrast: Work until 5 p.m. (keep working, stop at 5) vs finish by 5 p.m. (be done before 5 — stop whenever you finish)
4. WITHIN — Inside a Time Frame
Meaning: Something happens at some point inside a given period — not at the end of it, not continuously through it, just somewhere inside it.
Structure: Action + within + time period
Examples:
- The package will arrive within three days. (Sometime in the next three days — could be day one, two, or three.)
- Please reply within 24 hours. (Any point inside the 24-hour window is acceptable.)
- The results were announced within a week of the exam. (Happened inside that one-week period.)
The key signal: Within gives you a window — a range of acceptable time. By gives you a wall — a hard outer limit.
5. UP TO — A Limit or Maximum Point
Meaning: Reaching as far as a certain point — in time, number, or extent — but not beyond it.
Structure: Action/amount + up to + limit
Examples:
- You can take up to three attempts. (Three is the maximum — not four.)
- The sale is valid up to 31st March. (Ends on that date — not after.)
- She studied up to Chapter 7 for the test. (Stopped at Chapter 7 — did not go further.)
The key signal: Up to defines a ceiling or boundary — the maximum permissible point.
Upto or Up To — Which One Is Correct?
This is one of the most common written English errors in student assignments, emails, and exam papers — especially across South Asian classrooms.
Upto is incorrect. Up to is always written as two separate words.
There is no version of English — British, American, or Australian — where upto is accepted as standard spelling.
| Incorrect | Correct |
|---|---|
| Submit upto three files. | Submit up to three files. |
| Valid upto 31st March. | Valid up to 31st March. |
| She studied upto Chapter 5. | She studied up to Chapter 5. |
Why do so many students write “upto”? Because it functions like a single-unit preposition in meaning — so the brain naturally compresses it into one word. Words like into, onto, upon reinforce this habit. But up to has never followed that pattern in standard written English.
Simple rule to remember:
If you can replace it with “as far as” or “a maximum of” — it is up to, always with a space.
6. TILL NOW / UP UNTIL NOW — Everything From the Past to This Exact Moment
Meaning: Refers to the entire stretch of time from some starting point all the way to the present. Often used to highlight that something has been true or ongoing and may now be changing.
Structure: Statement + till now / up until now
Examples:
- Till now, no one has challenged that record. (From whenever the record was set — right up to today.)
- Up until now, the policy had never been questioned. (Continuous situation — ending or shifting at this present moment.)
- I had never travelled alone till now. (First time — all previous time lacked this experience.)
The key signal: These expressions carry a sense of “things are about to change” — a turning point is implied. They work beautifully in essays, storytelling, and formal writing alike.
Till Now vs Still Now — Which One Is Correct?
This is a mistake that appears constantly in student writing, spoken English, and even in printed study materials across South Asian classrooms.
“Still now” is non-standard. “Till now” is the correct expression.
| Incorrect | Correct |
|---|---|
| Still now I have not received the letter. | Till now I have not received the letter. |
| Still now no one has solved this problem. | Till now no one has solved this problem. |
| She is still now waiting for results. | She is still waiting for results. |
Why do students say “still now”?
Two reasons. First — still and till now express similar ideas, so students blend them into still now assuming it is stronger or more complete. It is neither. It is simply incorrect.
Second — in several regional Indian languages, the literal translation of the equivalent phrase produces something close to still now in English. This is a mother tongue interference error — one of the most common sources of non-standard English usage.
The difference between “still” and “till now”:
| Expression | Function | Example |
|---|---|---|
| Still | Ongoing state — happening even now | She is still waiting. |
| Till now | From a past point up to the present | Till now, no reply has come. |
| Still now ❌ | Non-standard — avoid completely | Never use in written English |
Simple rule:
- Use still when describing something currently ongoing
- Use till now when referring to the entire period from past to present
- Never combine them into still now
7. TILL THEN — From Now Until That Future Point
Meaning: Refers to the gap between now and a specific future moment — everything that happens in between.
Structure: Statement + till then / till then + instruction
Examples:
- The results come out Friday. Till then, stay focused. (Between now and Friday — use that time well.)
- We meet again in June. Till then, keep practising. (The gap between today and June.)
- The visa arrives next week. Till then, do not book flights. (A caution for the in-between period.)
The key signal: Till then is almost always a closing or transitional expression — it wraps up one moment and points forward to the next.
8. UP UNTIL NOW — Stronger and More Formal Than Till Now
Meaning: Carries the same meaning as till now but with greater emphasis and formality. Used when the writer wants to stress that a long-standing situation is finally changing.
Structure: Up until now + statement / statement + up until now
Examples:
- Up until now, no student had ever scored full marks in this paper. (Long-standing record — now broken.)
- Up until now, the company had operated without a formal HR policy. (A significant gap now being addressed.)
- She had, up until now, refused every offer that came her way. (Pattern of behaviour — now shifting.)
The key signal: Choose up until now over till now when the tone is formal, academic, or emphatic. In casual writing, till now works perfectly well.
9. LATEST BY — The Absolute Final Deadline
Meaning: The outermost possible deadline — not a suggestion, not a range. The very last acceptable moment.
Structure: Task + latest by + final deadline
Examples:
- Submit the form latest by 11:59 p.m. tonight. (Not a minute after — this is the hard cut-off.)
- Reach the venue latest by 9 a.m. (Arriving at 9:01 is too late.)
- The payment must be cleared latest by the 30th. (The 30th is non-negotiable — not the 31st.)
The key signal: Latest by is stronger and more urgent than by alone. Use it when the deadline is absolute and non-negotiable — in official notices, formal instructions, and professional communications.
The Master Comparison Table
| Expression | Core Function | Implies Duration? | Implies Deadline? |
|---|---|---|---|
| Until | Continuous action up to a point | Yes | Yes |
| Till | Informal until | Yes | Yes |
| By | Completion before a point | No | Yes |
| Within | Sometime inside a period | No | Soft limit |
| Up To | Maximum boundary | No | Ceiling |
| Till Now / Up Until Now | From past to present | Yes | No |
| Still Now | ❌ Non-standard — never use | — | — |
| Till Then | From present to future point | Yes | No |
| Latest By | Absolute final deadline | No | Hard limit |
Quick Decision Guide — Which Expression Do You Need?
- Continuous action ending at a point? → Until / Till
- Something must be done before a time? → By
- Absolute, no-excuse final deadline? → Latest By
- Anytime inside a time window? → Within
- A maximum amount or point? → Up To
- Everything from the past to right now? → Till Now / Up Until Now
- The gap between now and a future moment? → Till Then
- Currently ongoing with no end in sight? → Still (never “still now”)
Test Yourself — Fill in the Blank
- Please submit your application __________ Monday. (deadline)
- She had never visited Delhi __________ . (up to present)
- You may request __________ two extensions per semester. (maximum)
- The event goes on __________ midnight. (continuous)
- Results will be declared __________ 48 hours. (inside a window)
- He is __________ working on the project. (currently ongoing)
- __________ no one has found a solution to this. (from past to present)
Answers: 1. by · 2. till now · 3. up to · 4. until · 5. within · 6. still · 7. Till now
Drop your score in the comments. Which expression had you confused the longest?
Closing Note
These expressions are not interchangeable — each one carves out its own precise slice of time. Until stretches. By cuts. Within opens a window. Latest by slams it shut. Up until now marks a turning point. Still now — forget it exists.
Once you see each expression as its own precision instrument, your writing becomes sharper, cleaner, and more confident — in exams, emails, and everyday English.
Still working on your present perfect tense? Our detailed guide on the use of have had breaks down the present perfect tense with real examples, comparisons, and a practice test — the next essential stop in your grammar journey.