1. Paul (talk) with a pretty lady when I saw him 2. They(decorate) their house after his son (go) to a university 3. Frank (not return) his school since he (leave) three years ago

2 câu trả lời

1.was talking

2.decorated - had gone 

3.didn't return - has left

1. talked

2. will decorate; goes

3. hasn't returned; left

* TRƯỚC SINCE HTHT, SAU SINCE QKĐ

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