They also....many years ago.

A

Those aren't variants, however; they all distinct verb forms.

I know perfectly that they are distinct verb forms. You dont understand my question. What variant A, B, C or D should be placed into the empty space? and why?

demonuaI know perfectly that they are distinct verb forms

Then don't use 'variants'.

demonuaYou dont understand my question

I do so perfectly.

demonuaWhat variant A, B, C or D should be placed into the empty space?

I have already answered this.

demonuaand why?

I didnt understand anything you said.

demonuaI didnt understand anything you said.

The first letter of Mr M's first post was the answer to your question. Did you understand that?

There is no text, such is an exercise in English texbook. And there are 4 variants or how to name this in another way A, B, C, D. I dont which of them put into empty space. If it is bad grammar what verb form must be correct?

demonuaThere is no text, such is an exercise in English texbook. And there are 4 variants or how to name this in another way A, B, C, D. I dont which of them put into empty space. If it is bad grammar what verb form must be correct?

Have you read any of the responses?

and why A? Thanks

OK. Thank you all. I was wrong reading the answers inattentively