We can use for, since, and ago to talk about time.
We use for when we talk about how long something happens. The structure is for + a time period, and we usually use for with the present perfect tense:
- I have been working in this company for two years.
- I haven’t seen Jack for such a long time.
- We’ve been waiting at this bus stop for twenty minutes.
We also use since when we talk about how long something happens. The structure is since + a point in time, and we also usually use since with the present perfect tense:
- I have been working in this company since 2010.
- I haven’t seen Jack since 2005.
- We’ve been waiting at this bus stop since 9:30.
We use ago when we want to talk about time before now. The structure is time period + ago. We usually use ago with the simple past tense:
- I started working at this company two years ago.
- The last tie I saw Jack was seven years ago.
- We arrived at the bus stop twenty minutes ago.
How long have you been working at your current job, or studying at you school? Can you make three sentences here using for, since, and ago? Leave a comment below and let us know!