讲义

it 指前面提到过相同的某物(同一物；那一个)

one / ones 代替前面提过的不定名词以避免重复(某一个)

"I bought a digital camera yesterday."「我昨天买了一个数字相机。」

"Can I have a look at it? I want to buy one, too."

「我可以看一看吗？，我也想买一个。」

"Do you have a knife? I need one to sharpen my pencil."

「你有刀片吗？ 我需要一把刀片削铅笔。」

"Yes, I have one. It is in my pencil case."

「我有一把，在我铅笔盒里。」

"Don't forget your lunchbox!" "I've got it."

「不要忘记你的便当！」 「我已经拿了。」

"These apples are too small. Do you have bigger ones?"

这些苹果太小了，你们有大一点儿的吗？

"The bigger ones are all sold out. We have only small ones left now." 「大的都卖完了，现在只剩下小的。」