for

in

up

on

When she telephoned, we were having supper.

When she telephoned, we had supper.

When she telephoned, we were had to have supper.

 When she telephoned, we had had supper.

Reading my favourite hobby.

Reading is favourite hobby.

Reading is a favourite hobby.

Reading is my favourite hobby.

 I was very sorry to offend you.

I am very sorry to offend you.

I am very sorry to have offended you.

I am very sorry to be offending you.

I am glad to see you on the concert.

I was glad to see you on the concert.

I am glad to be seeing you on the concert.

I am glad to have seen you on the concert.

He says he enjoyed playing the guitar.

He says he was fond of playing the guitar.

He says he is fond of playing the guitar.

He said he would enjoy playing the guitar.

Were you see this film?

Have you already seen this film?

Do you see this film?

Did you see this film?

How much did it take you to get to your college?

How long does it take you to get to your college?

How much time does it take you to get to your college?

How many time does it take you to get to your college?

Thank you having visited us.

Thank for having visited us.

Thank you for visited us.

Thank you for having visited us.

He says he would write the letter in time.

He said he will write the letter in time.

He said he writes the letter in time.

He said that he would write the letter in time.