1.Why ……………………..you ………………………….(not go) to the party last night?
2.I’m going to the post office(buy) ………………………………some stamps
1.Why ……………………..you ………………………….(not go) to the party last night?
2.I’m going to the post office(buy) ………………………………some stamps
1.didn’t you go(last night->QKĐ)
2.to buy(in order to=so as to=to+V-inf:để làm gì,chỉ mục đích của cộng việc)
1. Why didn’t you go to the party last night?
2. I’m going to the post office to buy some stamps