if表如果的用法

if表如果的用法
if表如果的用法

if表如果的用法
if
conj.
[表示条件, 假设]如果, 要是; 假如
[表示让步]虽然; 即使
是否, 是不是
(＝whenever)无论何时; 当
[表示愿望, 感叹]要是.多好
If weather permits.
(常略作I.W.P)如果天气好的话.
I'll do it if I die in the attempt.
即使会丧命我也要试一下.
Ask if he is at home.
问一问他在不在家.
If I do not understand what he says, I always ask him.
我不懂他的话时, 总是去问他.
If I haven't lost my watch!
我的表要是不丢该多好!
If I only knew!
要是我知道该多好.
习惯用语
if and when 如果, 万一
If ifs and ans were pots and pans, there'd be no trade for tinkers. [谚]如果种种“假如”能够变成深锅和浅锅, 补锅匠就没有生意了.(意思是:如果人们的主观愿望都能实现, 天下就太平了)
if only 只要; 要是.就好, 但愿

引导条件状语从句
这个句子特点是主将从线
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if
conjunction
introducing a conditional clause
〔引导条件状语从句〕如果
■on the condition or supposition that; in the event that
如果
if you have a complaint, write to the director.
如...

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if
conjunction
introducing a conditional clause
〔引导条件状语从句〕如果
■on the condition or supposition that; in the event that
如果
if you have a complaint, write to the director.
如果你想抱怨，就给厂长写信。
if you like I'll put in a word for you.
如果你愿意，我就替你说句好话。
■(with past tense) introducing a hypothetical situation
〔后跟过去时态，表示假设〕要是，假如
if you had stayed, this would never have happened.
要是你当时留了下来，就不会发生这件事。
常用词组
if and only if
used to introduce a condition which is necessary as well as sufficient
当且仅当
witches are real if and only if there are criteria for identifying witches.
当且仅当有标准识别女巫，女巫才是真实存在的。
if and when
at a future time (should it arise)
如果，万一
if and when the film gets the green light, be sure you've read the book first.
万一电影得到许可，千万保证你已经读过那本书了。
if anything
used to suggest tentatively that something may be the case (often the opposite of something previously implied)
如果是这样的话（之前多已提及相反的情况）
I haven't made much of this—if anything, I've played it down.
对此我并没有加以重视——如果是这样的话，那我是看低它了。
if I were you
used to accompany a piece of advice
（表示建议）换作是我
I would go to see him if I were you.
换作是我，我会去见他。
if not
perhaps even (used to introduce a more extreme term than one first mentioned)
〔用于提出更极端的说法〕甚至可能
hundreds if not thousands of germs.
数以百计甚至可能数以千计的细菌。
if only
even if for no other reason than
即使只为了
Willy would have to tell George more, if only to stop him pestering.
即使只为了阻止乔治惹恼别人，威利也会告诉他更多的。
used to express a wish, especially regretfully
要 是…就好了
if only I had listened to you.
如果我听你的话就好了。
if so
if that is the case
若是这样

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