不能用關係代詞 Which 的幾種情況
1.當先行詞為all, little, much, few, everything, none 等不定代詞時關係代詞用that而不用which. I will tell him all
that you told me at the ball.
There are few books that you can read in this book store.
2.當先行詞既有人又有物時,關係代詞用that, 不用which.
He asked about the factories and workers that he had visited.
3.當先行詞有形容詞最高級修飾時,關係代詞用that, 而不用which.
This is the best novel that I have ever read.
Guilin is one of the most beautiful cities that I have ever visited.
4.當先行詞有序數詞修飾時,關係代詞用that, 不用which.
The first sight that was caught at the Great Wall has made a lasting impression on him. 5.當先行詞被the only, the
very, the same, the right等修飾時,關係代詞用that,不用which.
That is the very thing that we can do.
It is the only book that he bought himself.
6.當先行詞被all, every, any, much, little, few, no等修飾時,關係代詞用that,不用which.
You can take any room that you like.
There is no clothes that fit you here.
7.當主句是以which開頭的特殊問句時,定語從句關係代詞一般用that而不用which.
Which of the books that had pictures was worth reading?
8.在強調句型" It is ... that ..." 中,只用that,不用which.
It is in this room that he was born twenty years ago.
9.在" such (the same) ... as ..." 句型中,關係代詞要用as, 而不用which.
We need such materials as (not which) can bear high temperature.
10.表示" 正如... 那樣 "," 正象..." 之意時, 用as, 不用which.
Mary was late again, as had been expected.
11.As 引導的定語從句可以放在主句前面, 也可以放在主句後面或主句中間,而由 which引導的定語從句只能放在主句後面。
As we all know, oceans cover more than 70% of the earth.
used to/be used to的分別
used to do："過去常常"表示過去習慣性的動作或狀態，但如今已不存在。
Mother used not to be so forgetful.
Scarf used to take a walk. (過去常常散步)
be used to doing： 對……已感到習慣，或"習慣於"，to是介詞，後需加名詞或動名詞。
He is used to a vegetarian diet.
Scarf is used to taking a walk.(現在習慣於散步)
used to 的用法
否定式簡寫為usedn't) 過去經常，以前常常
We used to go there every year. (我每年都去那兒。)
He is not what he used to be.
他已不是舊日的他了。
我們公司過去和他們的公司常有業務往來。
This used to be a shabby house. (此房年久失修)
used to,would這兩個詞語都可以表示過去常做某事，有時可以換用。
used to do 強調整過去習慣性的行為或狀態，但是現在沒有這種行為或狀態了。因此，這個短語的內涵是今昔對比。