Helpppppppppppppppppp

Hành động trước - sau:

Hành động diễn ra trước --> QKHT

Hành động diễn ra sau--> QKĐ

After + QKHT, QKĐ

Before + QKĐ, QKHT

When + QKĐ, QKHT

By the time + QKĐ, QKHT

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QKĐ: S + V2/ed 

QKĐ: S + was/were ..

QKHT: S + had + V3/ed 

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1. Before I went to school, Frank had called me.

2. After I had washed the dishes, I watched TV. 

3. Before she had lunch, she had washed her hands.

4. After they had bought a ball, the boys played football. 

5. Before the guests came, my mother had made a cake.

6. After David had gone home, we arrived. 

7. Before we took a look around the shops, we had had lunch.

8. When we got out of the office, the light had gone out.

9. By the time we started our work, she had explained everything clearly.

`color{orange}{~MiaMB~}`