`1.` He needs to find a job and live on his own now.

`->` Need + to V : Cần làm gì

`2.` I musn't go home late.

`->` Mustn't + V `=` Be not + allowed + to V : Không được phép làm gì

`3.` Lucy has not worn that dress since Barbara's wedding.

`4.` My father has not gone to Vung Tau for 2 years. 

`->` The last time + S + Ved + was + thời gian + ago

`=` S + have/has + not + PII....

Các công thức đổi HTHT - QKĐ

S + has/have + not + V3/ed + for/since + time 

--> S + last + V2/ed 

--> The last time + S+ V2/ed + was + time 

--> It is / has been + time + since + S+ (last) + V2/ed 

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1. He needs to find a job and live on his own now.

It is necessary + (for O) + to V = need + to V : cần 

2. I mustn’t go home late.

not allow + O + to V = mustn’t + V1: không được làm gì (mang tính bắt buộc)

3. Lucy has not worn that dress since Barbara’s wedding.

4. My father has not gone to Vung Tau for 2 years.

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