短文改错,求讲解He always made good preparations for the lessons,(and)tried her best to make her classes lively.请问为什么要加and,不加可以吗?在什么情况下需要加and?

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短文改错,求讲解
He always made good preparations for the lessons,(and)tried her best to make her classes lively.请问为什么要加and,不加可以吗?在什么情况下需要加and?

一定得加and
因为,一个句子只能有一个动词,除非有连词,则可以再连一个主谓
你这个句子,只是以逗号相连,因此,前面已经有了动词made,后面的tired 这个动词,要么你加and 连词,要么try 要处理成非谓语,trying

【解答】正确句子:【She】 always made good preparations for the lessons【and】 tried her best to make her classes lively.她把课准备到非常好并且尽力让她的课生动。
这个句子是并列谓语:有两个动词词词组, made good preparations for the lessons与 tried h...

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【解答】正确句子:【She】 always made good preparations for the lessons【and】 tried her best to make her classes lively.她把课准备到非常好并且尽力让她的课生动。
这个句子是并列谓语:有两个动词词词组, made good preparations for the lessons与 tried her best to make her classes lively.
例如They talked and laughed and went out the classroom.他们又说又笑走出了教室。

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