i told him many times but he failed _____(understand) it.

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itoldhimmanytimesbuthefailed_____(understand)it.itoldhimmanytimesbuthefailed_____(understand)it.itol

i told him many times but he failed _____(understand) it.
i told him many times but he failed _____(understand) it.

i told him many times but he failed _____(understand) it.
to understand
fail to do sth 做某事失败,不能做某事
我告诉他很多次了,但是他不能理解.

to understand
fail to do 没能....

to understand

to understandfail in doing sth 表示坐什么事失败了
或者 fail to do sth 表示没能做成没事

I told him many times but he failed (understanding) it.
我告诉过他很多次了,可是他不理解,填ing形式
这里的语法是fail (in) doing something, in可以省略

to understand

to understand