if only和only if的用法 有哪些造句

含義不同。only if意為只有……才、唯一的條件是……，副詞only是中心詞，而從屬連接詞if只是用來連接從句的。而if only是if的一種強化形式，不僅能表達說話人的愿望，還能表達條件，意為要是...多好。

if only和only if的用法

一、用法不同

1、if only

用法：if only 用于虛擬語氣，它用來表達一個不可能實現的愿望或假設。

2、only if

用法：用于引導條件狀語從句，比if所表達的語氣更強烈。置句首可引起倒裝。

二、含義不同

1、if only

釋義：要是...就好了。

2、only if

釋義：僅僅如果。

三、側重點不同

1、if only

解析：if作為從屬連詞,可引導條件狀語從句、讓步狀語從句和名詞從句。

2、only if

解析：if可引導名詞性從句,作“是否”解,常放在ask, doubt, know, learn, see, wonder等動詞后。一般用在口語中，而且不能用于句首。

only if的造句

Only if I get a job will I have enough money to go to school.

我只有找到了工作才有足夠的錢上學。

Only if a teacher has given permission is a student allowed to enter this room.

只有得到教師的允許，學生才可以進這間屋。

Our prices are in force only if you order by return mail.

我方價格僅以你方速復我訂貨，才有效。

The company will succeed only if it have sufficient backing.

只有當該公司獲得足夠的資助，它才會成功。

I can buy the house only if a mortgage for 2000 dollars is available.

只有拿到兩千美元的抵押貸款，我才買得起那棟房子。

if only造句

if only the sun would come out, we could have a wonderful day.

如果太陽出來了，我們就可以有一個美好的一天。

A contract is invalidated if only one party signs it.

Now if only the robot could pay college tuition.

If only I hadn't been so smug, if only I'd gone to the window, perhaps I could have done something.

But I was only relieved to have my burden removed, if only temporarily.