一个句子中有两个动词,两个都要过去式吗?如he left the room after he goodbye.

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• 一个句子中有两个动词,两个都要过去式吗?如he left the room after he goodbye.
• 例句：He help his mother clean the room.由此引发的两个问题!在过去式中,一个句子,不用连词连接,可以有两个过去式吗?例句该怎样改成过去式的呢?是只把help加ed,还是help和clean一起加ed?在一般现在时中,一个句子,是第三人称单数时,可以两个动词都加s吗?我知道句子中如果有does,另一个动词要原形,可是有两个动词了,该如何?是只把help加s,还是help和clean一起加s?我个人认为问题一和二的动词都是一个变形,一个原形,
• 一个句子中有两个动词,两个都要过去式吗?如he left the room after he goodbye.
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• 一个句子中有两个动词,两个都要过去式吗?如：The attached is engineering drawing for customer needed change,we have changed and pls confirm by customer.这句子对吗?
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