điền thì đúng của từ 

`1`

`@` After she had washed her clothes , she phoned me .

`@` Before she phoned me , she had washed her clothes .

`2`

`@` Before I saw Tom , I had met Lan first .

`@` After I had met Lan , I saw Tom .

`3`

`@` After she had sold the house , she sold her children .

`@` Before she sold her children , After she had sold the house .

`4`

`@` After I had done my housework , I did my homework .

`@` Before I did my homework , I had done my housework .

`------------`

`@` Chuyển đổi ''before'' và ''after'' trong thì quá khứ hoàn thành .

`<=>` Before + S + V(quá khứ) + O , S + had + V3/Vpp + O .

`<=>` After + S + had + V3/Vpp + O , S + V(quá khứ) + O .

1. After she had washed her clothes, she phoned me

   Before she phoned me, she had washed her colthes

2. Before I saw him, I had met Lan first

   After I had met Lan first, I saw him

3. After she had sold the house, she sold her children

  Before she sold her children, she had sold the house

4. After I had done my housework, I did my homework

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- Before + S + V2 + O, S + had + VpII + O

- After + S + had + VpII, S + V2 + O