Let’s invite Danny to help us put up the tree.help 与 put up两

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Let’s invite Danny to help us put up the tree.help 与 put up两个动词之间为什么不用to?

先说说Help
help用作动词,表示帮助.
通常用
1.help sb. with sth.（在某方面帮助某人）
2.help sb. do sth.（帮助某人做某事）
For example:I can help you clean the classroom
我可以帮你打扫教室
3.help sb. to do sth.（帮助某人做某事）
For example:I can help you to clean the classroom
（同2一样的意思,没有区别）
“to”在这里没有严格限制.可有可无.
Put up 这里就相当于一个及物动词,可以在其后直接加名词.
EG:Please put up your hand if you have any questions.
谁要有问题, 就请举手.
We'd better put up a notice here.
我们最好在这儿贴一张通知.

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