English grammar
For, since and ago 📕
For: a period of time (how long?)
I have lived here for three years.
We waited for two hours.
Since: a starting point (from when?)
I have lived here since 2022.
She has worked here since March.
I haven't eaten since this morning.
| for + period | since + starting point |
| for ten minutes | since ten o'clock |
| for two weeks | since Monday |
| for a long time | since I was a child |
Ago: how far back in the past
Ago comes after the time period, and we use it with the past simple.
I moved to Norway two years ago.
She called ten minutes ago.
✗ I came here since two years.
✓ I came here two years ago.
✗ I live here since 2020.
✓ I have lived here since 2020.
💡 Use the present perfect with since, and often with for, when the situation continues now.