`11.` While we were having the middle of the film, the light went out.

- Thì QKTD

- While + S + was/were + V-ing + ...,S + V2/V-ed + ...

`12.` After she had come to my house, she had dinner together.

- Before we had dinner together, she had come to my house.

- After + S + had + VpII + ...,S + V2/V-ed + ...

- Before + S + V2/V-ed + ...,S + had + VpII + ....

`13.` It is ages since I last went to an Indian restaurant.

- It's + time + since + S + last + V2/V-ed + ....

`->` S + haven't/hasn't + VpII + ... + for + time

`14.` Peter has writted novels for two years.

- S + started/began/finished + to V/V-ing + ... + time

`->` S + have/has + VpII + ... + for + time

`15.` The last time I had a Chinese meal was 4 years ago.

- The last time + S + V2/V-ed + ... + was + time + ago

`->` S + haven't/hasn't + VpII + ... + for + time

`11.` While we were having the middle of the film, the light went out.

- While + QKTD, QKD

`12.` After she had come to my house, she had dinner together.

`->` Before we had dinner together, she had come to my house.

- After + QKHT, QKD

- Before + QKD,QKHT

`13.` It is ages since I last went to an Indian restaurant.

- It's + time + since + S + last + V2/V-ed + ....

`14.` Peter has writted novels for two years.

- S + have/has + VpII + ... + for + time

`15.` The last time I had a Chinese meal was 4 years ago.

- The last time + S + V2/V-ed + ...