两句英语合成一句（after）She wrote the letter .She wenttothe post office.(after) He had dinner.He went to the cinema.(when)I fastened my seat belt.The plane took off.

两句英语合成一句（after）She wrote the letter .She wenttothe post office.(after) He had dinner.He went to the cinema.(when)I fastened my seat belt.The plane took off.
两句英语合成一句
（after）She wrote the letter .She wenttothe post office.
(after) He had dinner.He went to the cinema.
(when)I fastened my seat belt.The plane took off.

两句英语合成一句（after）She wrote the letter .She wenttothe post office.(after) He had dinner.He went to the cinema.(when)I fastened my seat belt.The plane took off.
She went to the post office after she had written the letter.
He went to the cinema after he had have dinner.
I fastened my seat belt when the plane took off.
根据事情发生的时间顺序来安排after或when的位置,when 是同时发生的,after 后面接之前的动作.

She went to the post office after she wrote the letter .
He went to the cinema after he had dinner.
I fastened my seat belt when the plane took off.

试试吧，希望可以。
she went to the post office after she had wrote the letter.
he went to the cinema after he he had have dinner.
when the plane took off ,i fastened my seat belt.

要看事情发生的时间顺序来安排after或when的位置：
She wenttothe post office after She wrote the letter .
He went to the cinema after He had dinner.
I fastened my seat belt when the plane took off.

she went to the post office after she had written the letter
He went to the cinema after he had have dinner
I fastened my seat belt when the plane was taking off.

（after）She wrote the letter .She wenttothe post office.
she went to the post office after she had written the letter
(after) He had dinner.He went to the cinema.
He went to the cinema a...

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（after）She wrote the letter .She wenttothe post office.
she went to the post office after she had written the letter
(after) He had dinner.He went to the cinema.
He went to the cinema after he had have dinner
(when)I fastened my seat belt. The plane took off.
I fastened my seat belt when the plane was taking off.

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