Past perfect \past simple 1) by 8 o'clock yesterday i ( to do) my homewrok . 2) on my way home i ( to remenber ) thet i ( to leave) my roport at home . 3) when i ( to come ) home , my mother ( to tell) me thet she ( to receive) the letter from grandmother. 4) suddenly he ( to remember ) thet he ( not to ring ) her up in the morning. 5) i ( to know) thet my friend ( not yet to come ) . 6) the teachar ( to understand ) thet lena ( not to do ) her homework. 7) nick ( to return ) from the park at 5 o'clock 8)nick ( to return ) from the park by 5 o'clock . 9) ann ( to finish ) my homework at seven o'clock . 10) ann ( to finish ) my homework by seven o'clock 11) when they ( to enter ) the hall, the performance alredy ( to begin ) 12)she ( to thenk) that gert and lanny ( to quarrel) 13) during the holidays my griend ( to visit ) the village where he ( to live ) in his childhood . 14) last year all friends ( to spend ) their holidays at the seaaside .

1) By 8 o'clock yesterday I had done my homewrok .
2) On my way  home I remembered thet I had left my roport at home .
3) When I came home , my mother told me  thet  she had received the  letter from  grandmother. 
4) Suddenly  he remembered thet he hadn't rung her up in the  morning.
5) I knew thet my  friend hadn't come home yet .
6) The teachar  understood thet Lena hand't done her homework. 
7) Nick returned from the park at 5  o'clock 
8)Nick had returned from the  park by  5 o'clock .
9) Ann finished my homework at  seven  o'clock .
10) Ann had finished my  homework  by  seven  o'clock 
11) When they entered the hall, the performance had already begun.
12)She thought that Gert and  Lanny had to quarreled
13) During the holidays my griend visited the village where he had lived  in his childhood .
14) Last year all friends spent their holidays at the seaaside .