题目内容：

you 'better ,i think ,give him a hand when necessary 分析句子,
并说明Give为何不用进行时,或者to give 之类

优质解答

I think 是插入语 把插入语排除在外
这句话是 You'd better give him a hand when necessary
had better do sth 最好做某事 所以要加动词原形 give
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