my mother (not buy) that hat three day ago
the house (not paint) 2 year a go
he (not study) this school a years a go
they (not come) nha trang last day
my mother(not buy) that hat three day a go
1. my mother (not buy) didn't buy that hat three day ago 2. the house (not paint) wasn't painted 2 years ago 3. he (not study) didn't study this school 1 year ago 4. they (not come) didn't come nha trang last day 5. my mother(not buy) didn't buy that hat three days ago