1. I bought a new bicycle last week.
- DHNB thì quá khứ đơn : last week
- Cấu trúc : S+Vpp/ed
2. Mai isn't old enough to be in my class.
Cấu trúc enough : S + am/is/are + (not) + Adj + enough + to + V(inf) + O
3. They gave him a dictionary yesterday.
- DHNB thì quá khứ đơn : yesterday
- Cấu trúc : S+Vpp/ed