since two years ago

[tulipflower]

I was teaching present perfect when one of my students wrote a sentence with the following structure: "since 2 years ago".
I haven't seen my sister since 2 years ago.

It sounds odd to me. Can you tell me if this structure is acceptable in English?

 

[Rover_KE]

No.

I haven't seen my sister for two years.
I haven't seen my sister since 2020.

I last saw my sister two years ago.

 

[emsr2d2]

Simple rule - don't use "since" and "ago" together.

 

[5jj]

Can you tell me if this structure is acceptable in English?

I disagree slightly with my colleagues.

The versions suggested by Rover are what I would recommend that learners use, but I would say that 'since two years ago' is not actually ungrammatical.

 

[Skrej]

The basic rule is use 'for' when talking about a period of time, and 'since' for a specific point in time.

Under that rule, 'two weeks ago' is a specific starting point. I agree with 5jj that the original isn't necessarily ungrammatical, although it's not the most natural way to express it. I wouldn't encourage its use, but I wouldn't mark it incorrect on an assignment, either.

 

[Tdol]

Not incorrect, but not good.