Since vs For: Simple Rules to Never Confuse Them Again
A tiny pair that causes big errors. Learn exactly when to use "since" and "for" with clear examples and a quick test.
4 min read · Published 2026-07-16
Indians often mix "since" and "for". The rule is simple once you see it, but most textbooks overcomplicate it. Here is the clean version with examples you will actually use.
Use "since" with a point in time
- since Monday
- since 2020
- since morning
- since I was a child
- since last Diwali
"Since" answers the question "from when?" It marks the starting point of something that continues now.
Use "for" with a duration
- for two days
- for three years
- for an hour
- for a long time
- for a week
"For" answers "how long?" It marks the length of time.
Examples side by side
- I have lived here since 2021.
- I have lived here for five years.
Both are correct but mean slightly different focus: one on the start, one on the length.
Quick test
If you can put a clock or date after it, use "since". If you can count the time, use "for". "Since 9 am" (point). "For 3 hours" (duration).
Common errors Indians make
Wrong: "I am waiting since two hours." Right: "I have been waiting for two hours." Wrong: "I know him since childhood." Right: "I have known him since childhood." Note the present perfect tense with "since".
Why tense matters
"Since" and "for" usually pair with present perfect (have/has + verb-ed), not simple present. "I live here since 2020" is wrong. Say "I have lived here since 2020."
Practice
Write 3 sentences with "since" and 3 with "for" today. Say them aloud. The SpeakNow grammar drill will check them and flag the wrong preposition. Ten minutes of daily practice removes this error permanently.
In daily sentences
'I have known her since college.' 'We have waited for the bus for twenty minutes.' These appear constantly in real talk. Catching them live, not just in exercises, is the goal. The next time you speak, listen for your own since/for and self-correct.
Start today
Write three 'since' and three 'for' sentences about your own life. Read them to a friend or to the SpeakNow app. One focused session beats a week of passive reading, because this is a habit of the tongue, not just the mind. When in doubt, say the sentence aloud and trust your ear - it usually knows the right form even if the rule feels fuzzy. Ears trained on real English beat rules memorised for a test.