The math problem is to difficult for us to work out.

The math problem is to difficult for us to work out.
为什么不用work it out
两者有什么区别
还有He passed me a knife to cut the cake with.
为什么不用cut the cake with it

野猪亭 1年前已收到3个回答举报

宝贝88 幼苗

共回答了20个问题采纳率：85% 举报

我们分析下成份,主语是is前面的,而后面又要让此成分做宾语,这样造成重复,故省略宾语,还有万万不可加it,句子就错了,两句可照此法记住,

1年前

非龙NO1 幼苗

共回答了52个问题举报

省略

1年前

花自与飘零幼苗

共回答了16个问题举报

简单来说就是宾语＋is＋adj。for sb to do
n。＋to do
do可以是及物动词和词组
翻下语法书吧

1年前

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你能帮帮他们吗

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