`1`. I was born in Da Nang, $which$ is famous for many interesting places.

* Sửa: that `->` which 

- "which" dùng thay cho vật trong mệnh đề quan hệ không xác định, không dùng "that"

`2`. I haven't met Hoa $for$ about seven months.

* Sửa: since `->` for 

- for + khoảng thời gian 

- Cấu trúc: S + have/has + Vpp + for + khoảng thời gian 

1. I was born in Da Nang, that is famous for many interesting places

`->`I was born in Da Nang, which is famous for many interesting places

2. I haven't met Hoa since about seven months

`->`I haven't met Hoa for about seven months

+ Với khoảng thời gian ta dùng $for$

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`CT` như trong hình ạ .