3. I really don’t know why she (not/enter) didn't enter…… the last contest. She (win)..won…..the first prize easily.
last -> QKD: S + V-ed/ VQK (bất quy tắc) + O
4. Linda has lost her passport again. It's the second time this (happen).has happened
HTHT : S + have/ has + V3
Sửa lại :5. It was a great party last night. (come)... Why didn't you come?
Vì ở đây là did + V mà câu này thiếu V( last-> QKĐ)
6. "Ann is in hospital." "Yes, I know. I (visit).......will visit........ her tomorrow
-> TLĐ: S + will + V(nguyên thể)