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两句英语合成一句(after)She wrote the letter .She wenttothe post offi

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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.