i'd like to help pitch in with dinner.中的help与pitch在语法上是什么关系。 i want to

i'd like to help pitch in with dinner.中的help与pitch在语法上是什么关系。 i want to leave the stew to simmer for 5 minutes.中为什么simmer不是被动语态to be simmered.

第一句是病句, 语法上虽然没错 help (to) do sth, 但语义上to pitch in并不是help的宾语,而是并列谓语动词, 句子应当是: I'd like to help and pitch in with the dinner. 或省略help, 因为pitch in包含帮助的意思, I'd like to pitch in with the diner.

第二句,simmer不用被动的, 类似中文"鸡汤炖2小时就够了。" 不说”鸡汤被炖2小时...“
The stew simmers for 5 minutes.追问

to simmer是不定式做目的状语吗。

追答

是不定式作宾语补语, leave the stew to simmer, 让这个炖菜炖5分钟

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