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为啥这里要用现在分词.-.-麻烦指点.

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为啥这里要用现在分词.-.-麻烦指点.
The passengers had a chat with the college students (helping out) as conductors during the summer vacation.
这里直接用 help out不行吗?-.-
还有一句
He told me and Anne (are thinking about ) leaving for Australia via HongKong sometime next month.
这里直接用 think about不行?-.-
为啥这里要用现在分词.-.-麻烦指点.
第一句中的 helping out 是分词做定语的修辞手法,修饰 college students,
college students helping out = college students who helped out
由于helping out 在句中的成份,决定了这里不能用 help out.
第二句 He told me 有误,可能是:
He and Ann (are thinking about) leaving ...
are thinking about 是 think about 的现在进行时态,作谓语,这里也可以用 think about,使句子成为:
He and Ann think about leaving...
但句子的意思有稍有不同.原句是:正在考虑,修改后成为:考虑