Jack couldn't help but ___(cry) when heis toy car fell in river.为什么添cry?

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Jack couldn't help but ___(cry) when heis toy car fell in river.为什么添cry?

Jack couldn't help but ___(cry) when heis toy car fell in river.为什么添cry?
Jack couldn't help but ___(cry) when heis toy car fell in river.
为什么添cry?

Jack couldn't help but ___(cry) when heis toy car fell in river.为什么添cry?
因为后面说的是 他的玩具掉到河里去了
所以是哭 cry
but 在这里后面是 不带to 的不等式
所以是动词原形
这里本来有个to 省略了

can't/coundn't help but do固定用法

首先你要理解句子的意思,这是必要条件....

could 是情态动词,要接动词原形啊, can't/coundn't help but do 也是常用的一种用法

是cry吗?我认为应该是crying。couldn't help doing sth是忍不住做某事的意思。

就是说在jsck的玩具掉到河里时,他情不自禁哭了。