He help his mother wash the clothes last weekend.里的help为什么不用加s

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• 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,
• He help his mother wash the clothes last weekend.里的help为什么不用加s
• He help his mother wash the clothes last weekend.里的help为什么不用加s
• At last,the little boy found his mother in the park这个句子的同义句是什么
• he had success in helping the girl find her mother的同义句he ____ in helping the girl find her mother.i taught my grandma （to send e-mails on the internet）?对画括号部分提问what did you ____ your grandma —— ——?we find it is interesting to talk with him.改为同义句we find it ____ ____ talk with him.each course costs him 249.99改为同义句it _____ him 249.99 to take each course.i sent him a toy cow as a gift.改为同义句i ___ a toy cow ___ ___ as a gift.