1 My mum started....in2015
=> My Mum has done volunteers since 2015 => dùng thì HTHT 
2 The last time I broke my legs was 5 years ago .
=> I haven't broken my legs for 5 years => dùng thì HTHT
3 We are making sticky rice right now .
=> Sticky rice is being made by us right now  => dùng cấu trúc câu bị động ở thì HTTD
4 Anna brought some food to the party .
=> Some food was brought to the party by Anna => dùng cấu trúc câu bị động ở thì quá khứ đơn
5 We often resolve conflicts in a friendly way.
=> Conflicts offten be resolved by us in a friendly way => dùng cấu trúc câu bị động ở thì HTĐ
6 He can....
=> I cant concentrate as well as him => dùng so sánh bằng
7 I've .....
=> This is the most expensive shirt that I've never bought