21 Mr. Hoang spent half an hour going to work yesterday
_ It take + smb + time + to V = S + spend + time + Ving
22 We have lived here for fifteen years
_ S + started/began + Ving/to V = S + have/has + PII
23 You'd better not eat too much meat.
_ had better not = shouldn't : không nên
24 You don't have to set off early.
_ S + have + to V : phải làm gì
25 Our house is the oldest in the living centre
_ So sánh nhất : adj - ngắn : S + + be + the + adj-est
26 Because he was lazy, he failed the exam
_ Because + clause(Nguyên nhân)
27 Hoa's collection has eight hundred stamps.
_ There is/are + N = S + has/have + N
28 Do you mind if I smoke in here ?
_ Would you mind if + S + Ved/cột 2 = Do you mind if + S + V(s/es)
29 The color of his briefcase is the same as mine
_ giống : S1 + be + the same as + S2
30 Unless the weather improved,the garden party won't take place.
_ Câu điều kiện loại 1 : If + S + V(s/es), S + will + V