想要考好英語六級怎麼能不知道這些常考句型呢?下面就讓小編爲大家詳解一下吧。
一、only引導的詞組或句子放在句首作狀語時，通常要用倒裝結構。如
Only in this way can you solve the problem.
只有通過這種方式你才能解決問題。
Only if you study hard can you pass the exam.
只有努力學習才能通過考試。
Only then did I realize my mistake.
只有那時我才意識到錯了。
二、not only...(but also)出現在句首時，如果架連接的是兩個句子，常用倒裝。如
Not only did we lose all our money,but we also came close to losing our lives.
我們不僅丟了錢，還差點把命丟了。
Not only did he speak correctly,but he also spoke easily.
他不僅說得準確，而且說得很輕鬆。
三、only放在不定式前面，常表示不愉快或出乎人們的意料的結果。如
I went all the way to his home only to find hime out at a meeting.
我徑直到他家裏去，不料發現他出去開會了。
I hurried to the post office only to find it closed.
我匆忙趕到郵局，不料已經關門了。
She went home only to find her house burglarized.
她回到家裏，發現房子被盜了。
四、“...”結構中，表示否定意思，但在“only ...”結構中，only too = very，表示肯定意思。如
The patient is too weak to walk.
那個病人太虛弱了，走不動。
We are only too willing to do it for you.
我們非常願意爲你做那事。
I am only too delighted to accept your king invitation.
我非常高興地接受你的邀請。
五、在“one of + 複數名詞 + 定語從句”的結構中，定語從句一般被看作修飾複數名詞，謂語要用複數形式。但在“the only one of + 複數名詞 + 定語從句”的結構中，定語從句卻被看作修飾“the only one”，謂語動詞要用單數形式。如
This is one of the best novels that have been published in the past two years.
這是近兩年出版的最好的小說之一。
He was the only one of the boys who was given a prize.
他是這些孩子中唯一受到獎勵的。
She is the only one of the girls who has been to the US.
她是那些女孩中唯一去過美國的。
六、If only 爲虛擬語氣的一種，表示願望或一個未實現的條件，多用於感嘆句，其主句常常省略。如
If only she would marry me!
她要是能和我結婚該多好!
If only he had known about it!
他那時要是知道這件事該多好!
If only you could have been here earlier that day!
要是你那天再早點到這就好了。
If only there were forty-eighty hours in a day.
要是一天有48個小時就好了。
延伸閱讀：
1.指人的關係代詞：who, whom, whose, that 的用法：
(1)作主語(who, that )
Those who are going to play in the match are to meet at the gate at 1:30 after lunch. 那些參加比賽的人午飯後1：30在大門口集合。
在本句中，先行詞是those;關係代詞who引導定語從句，同時代替先行詞在從句中擔任動詞are going to play 的主語。
The man who/that is talking with Mr. Wang is a famous doctor. 正在和王先生說話的那個人是一個有名的醫生。
在本句中，先行詞是the man;關係代詞who/that引導定語從句，同時代替先行詞在從句中擔任動詞is talking的主語。
這個複合句可以還原成兩個句子：The man is a famous doctor. He is talking with Mr. Wang.
(2)作賓語包括作介詞賓語(whom, that )。此種情況下的關係代詞可以省略;
This is just the man(whom/that) I want for the job.這正是我要的做這份工作的人。
在本句中，先行詞是the man;關係代詞whom/that 引導定語從句，同時代替先行詞在從句中擔任動詞want 的賓語。
(3)當關系代詞緊跟介詞作介詞賓語時，不能用that，也不能省略，
如：The book from which I got a lot of useful information was written by a famous scientist.
我從中得到許多有用信息的那本書是一位著名科學家寫的。
但是當介詞放在從句末尾時，作爲介詞賓語的關係代詞可以用that 並且可以省略。
如上頭兩句可改爲：
The book (that /which) I got a lot of information from was written by a famous scientist.
2.指物的關係代詞which和that的用法：
(1)作主語
This is the instruction manual which/that tells you how to operate the computer. 這是那本教你如何操作計算機的說明手冊。
(2)作賓語包括作介詞賓館。此種情況下的關係代詞可以省略：
The chair (which /that) you broke yesterday is now being repaired. 你昨天弄壞的那把椅子現在正在修理。
The accounts of the company, (which/that) I’ve been paying great attention to, are in balance.
我一直非常注意的公司賬目，是保持平衡的。
e 和of which 指代人或事物，作定語。of which 可用whose 代替;
The car whose lights (of which the lights/the lights of which) were all broken was my father’s.
那輛所有的燈都破了的汽車是我父親的。
That is the book whose cover (of which the cover/the cover of which ) was broken. 這就是那本封皮破了的書。
4.關係代詞的格應與它在從句中充當的'成分一致。特別要注意插入語，
如：Peter is the one who everybody believes will fail to bring off the contract. Peter 是那個人人都認爲不能完成合同的人。(everybody believes 是插入語) At the election I voted for the man whom I believed to be the most suitable. 在選舉的時候我投了我認爲最合適的那個人的票
5.關係代詞作從句的主語時，從句的動詞必須和先行詞的人稱和數一致： 例：These are the operating instructions that/which are written in English 。 這就是用英文寫成的使用說明。
6.非限定性定語從句不用that，只用who(whose, whom)和which代表人和物;
例：Her brothers, both of whom work in America, ring her up every week。 她的兄弟們兩個人都在美國工作每個星期都給她打電話。
7.關係副詞(=介詞+關係代詞)： 關係副詞 先行詞 在從句中的作用 說明 when(=at / on / in /during which),非正式文體中，有時用that代替關係副詞
where(=in / at which) 地點名詞 地點狀語
why=(for which) 只有reason 原因狀語
例：I shall never forget the day when (=on which) we first met. 我永遠也不會忘記我們第一次見面的那一天。