課本中不會教你的[I]397　it和one 替代普通名詞時的區(qū)別

397　it和one 替代普通名詞時的區(qū)別

① it代替已經(jīng)提到過的特指單數(shù)可數(shù)名詞，兩者為同一物。

As this chair is broken，I must have it repaired. 這張椅子壞了，我得叫人修理一下。

My father bought a pen and gave it to me. 我父親買了一支鋼筆，給我了。

A：Do you need the book？你需要這本書嗎？

B：Yes，I need it. 對，我需要（它）。

② one用以代替已經(jīng)提過的泛指單數(shù)的可數(shù)名詞，但one和已提過的名詞不是同一物。

我的傘丟了，我得買一把。

I have lost my umbrella and I must buy it.

I have lost my umbrella and I must buy one.

I have no dictionary，so I want to buy one. 我沒有詞典，所以想買一本。

A：Do you need a bike？你需要一輛自行車嗎？

B：Yes，I need one. 是的，我需要一輛。

③ 另外，it可以代替不可數(shù)名詞，而one只能代替可數(shù)名詞單數(shù)。

The wine is too strong，so I can't drink it. 這是度數(shù)太高的烈性酒，所以我不能喝。

This wine is milder than that. 這種酒比那種酒要淡。（不可用 than that one）