Writing

so

so a

such a

such

or........or.....

either .....or......

neither.........nor......

nor ....or.....

haven't they

didn't they

won't they

don't they

has written

wrote

has been writing

had written

remembered / had left

had remembered/ left

was remembering/ left

remembered/ has left

had listened

have been listening

listened

were listening

washed/was founding

was washing/found

have been washing the floor/found

was washing/ had found

has covered

had covered

covered

was covering

did

has been doing

had done

has done

When I looked out of the wondow, the children had played with a ball which Tom brought from the house.

When I looked out of the window, the children were playing with a ball which Tom had brought from home.

When I had looked out of the window, the children were playing with a ball, which Tom had brought from home.

I am waiting for a letter from my friend for a month already, but have not received it yet.

I have waited for a letter from my friend for a month already, but didn't receive it yet.

I have been waiting for a letter from my friend for a month already, but have not received it yet.

- Are they still writing the test?

- No, they have already written it.

-Do they still write the test?

- No, they wrote it already.

-Have they been still writing the test?

- No, they had already written it.