課本中不會教你的[D]205　depend on/upon和rely on/upon

205　depend on/upon和rely on/upon

① 表示“信賴，依賴”時，depend on/upon和rely on/upon常可換用。結構為：

depend on/rely on sb./sth.

depend on/rely on sb. to do sth.

We can depend on/rely on her words. 我們可以相信她的話。

He depends on/relies on you to help him. 他依靠你幫助他。

How could you depend on his promise？你怎么能相信他的許諾呢？

The girl no longer depends upon her parents. 這小女孩已經不依靠父母了。

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rely on 語氣比depend on重，多以人作主語。

A man should rely upon his own powers in the struggle of life. 一個人在生活的斗爭中應當依靠自身的力量。

② depend on還可以表示“以……而定，由……而定，取決于”，這時不可用rely on。

It depends on yourself. 這取決于你自己。

Good health depends on good food，exercise and getting enough sleep. 身體的健康要靠良好的食物、鍛煉和充足的睡眠。

③ depend用于It all depends或That depends結構中，意為“很難說，得看情況”，這時不可用rely。

Can you finish the work before Sunday？It all depends. 你能在星期天前完成這項工作嗎？這要看情況。

I don't know whether we'll have a picnic. It depends on the weather. 我不知道我們是否去野餐。那得看天氣。