替代詞one, ones, the one, the ones, that, those, it的用法區別：
替代詞可以用來替代句中或上文中已提到的名詞，以避免重複。但我們應注意他們所使用的場合。
1.One通常替代上文中出現過的可數名詞為中心詞組的整個名詞，指同類異物。One的複數形式是ones。One和ones既可指人也可指物，意思是指與有關名詞同類型的另一個（或另一些）。通常用one代替可數名詞，用ones代替複數可數名詞。如：
I have lost my pen，I am going to buy one。
我的鋼筆丟了，我要去買一隻。
I have a new coat and several old ones。
我有一件新大衣和幾件舊的。
one前可用this，that修飾，但ones前不能用these或those修飾，除非one前有形容詞。
I prefer this one to that one。我喜歡這個，而不喜歡那個。
These yellow ones are so small。I want those green ones。
這些黃的太小，我要那些綠的。
one和ones前面不能用物主代詞。如：
This is my apple and that is yours 。這是我的蘋果，那是你的
one和ones前面有修飾詞時，可以加冠詞，有時the ones和those可互換使用，但要求後面有修飾語。
I do not like this pen .Show me a better one。
我不喜歡這支鋼筆，再給我好一點的看看。
2. that 作為代詞用來代替上文中出現的名詞,它表示與前面同類的東西.
that既可代替可數名詞,又可代替不可數名詞,常要求有後置定語，一般不指人。如：
The price of wheat is higher than that of rice. 小麥的價格比大米高。
that one 用來指代同類事物中特指的另一個,可與that替換.如：
This story is not so interesting as the one / that we heard last night.
這個故事不如我們昨晚聽到的那一個有趣。
另外,that可代替上文中全句的內容,it和one則不能.如:
He will ask me to lend him some money and I can’t do that.
他問我借點錢，可我不能借。
We see him when he comes to town,but that isn’t often.
他進城時我們能見到他,但是這種情況不常有.
3.those可用來代替可數名詞的複數,表示特指。有時the ones和those可互換使用,常要求有後置定語.如:
The students in our class work harder than those in their class.
我們班的同學比他們班的同學學習更刻苦。
4. it代指前面提到過的名詞,而且就是那個名詞,即同類事物. It可以替代單數可數名詞和不可數名詞,如:
Do you want the magazine? Yes, I want it.
你想要這本雜誌嗎？是的，我要。
I don't want to drink the tea. It is too hot.
我不想喝這茶，它太熱了。
練習:
1.－How many of these books have you read？
______of them . Every one .
A．Many B. Some C.All D.None
2.—Have you heard of the accident about Lucy and her father？
—Accident？ No,I have’t . Tell me about_____.
A.it B.her C.him D.them
3.We』ve got two TV sets , but____ of them works well.
A.any B.both C.either D.neither
4.I haven’t checked my emails today , because there’s____ wrong with my computer.
A. something B.anything C.anything D.nothing
5.－When shall we go to the park, this moring or this afternoon?
－ ___is OK. I’m free the whole day.
A.Either B.Neither C.None D.Both
6.－ Is there _____ in today’s newspaper?
－Yes. Shenzhou VII will be sent up into space in the near future.
A.nothing new B.new nothing
C.anything new D.new anything
7.－Is ____ ready for the journey?
－No. We haven’t got a camera.
A .everthing B. something C.nothing D. anything
8.Mr Watson won’t be here next week, and_______.
A.neither his wife will B. neither his wife won’t
C.his wife won’t neither D. his wife won’t either