看这个句子they must be able to speak one foreign language fluentl

看这个句子
they must be able to speak one foreign language fluently
这个句子中be able to中的to不是介词吗,如果是speak 为什么不加inh

darkside1217 1年前已收到4个回答举报

woaihuanhuan520 幼苗

共回答了14个问题采纳率：100% 举报

短语
be able to do
to 后面就应该接的是动词原型

1年前

饿狼家族2 幼苗

共回答了27个问题举报

they must be able to speak one foreign language fluently
这个句子中be able to中的to不是介词吗,如果是speak 为什么不加inh
be able to:是个短语,具体来说的话,to应该是连接动词构成不定式的标志,没有词性. 如果是介词,后面应该加名词和动名词形式了.
speak可以做及物动词,表示讲某...

1年前

fedora5 幼苗

共回答了348个问题举报

TO 后面一定要跟动词原型

1年前

烟秋秋幼苗

共回答了13个问题举报

be able to do sth

1年前

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