1 would you mind if i open all of the windows --> opened 
3 Tom said that he is learning E in an evening class --> was
4 Tom asked me how long does it take me to go to school by bike --> took
5 A stranger asked me how far was it from my house to the school --> it was
6 i don't know where is he staying now --> he is 
7 they left to Ha Noi in a beautiful morning --> for
8 your window need to clean immediately . They are very dirty--> be cleaned