第一条定义是动词go和介词ahead的简单搭配，算不上短语。

The first item is simple collocation.

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另一个视角是体现时间范畴的处所动词及处所介词的特点。

One point is the locative words which are in the person of space category .

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他不愿接受这个职位，他这样做是有理由的。(介词转动词)。

He was reluctant to accept the position, and with reason.

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短语动词由一个动词和至少一个介词组成。

The set consists of a verb and at least one preposition.

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短语动词由一个动词和至少一个介词组成。

The set consists of a verb and at least one preposition.

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