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In the Pimsleur Mandarin course it uses 如果 (rúguǒ) to mean 'if', but the dictionary shows 要是 (yàoshì) to have a similar meaning:

如果: if; in case; in the event that
要是: if

Are there any differences between the meanings of the two, and how should I choose which to use?

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1  
+1 Good question :) –  Alenanno Feb 7 '12 at 20:18
    
Wow Chinese etymology (or how words are composed) is wonderful. 要是 -> want to be -> if –  Petruza Feb 10 '12 at 12:59

5 Answers 5

up vote 5 down vote accepted

In my opinion, they mean the same:"if". "要是" is a little informal and more common in oral speaking, while "如果" is formal, I think, but you will see both of them in books.

I could only catch up with one differences in use between them. For "要是“, because there is a "是" inside, when the verb in the "if-clause" is "是(to be)", "是" can be ommitted, however, "是" can't be ommitted when using "如果”.

Some examples:

要是我,[我]就不会那么做。 If [it were] me, [I] won't do that way.

如果是我,[我]就不会那么做。If [it were] me, [I] won't do that way.

Also, I don't agree with Tom Au that only "要是" has a "wish" mood. I think "如果" can be used in this case too.

要是我有100万就好了。 It's good if I have 1 million,really means I wish I could have 1 million

如果我有100万就好了。 It's good if I have 1 million,really means I wish I could have 1 million

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The difference is quite slight. The word '要是' is, typically, an oral expression of 'if', it's fine to use it in usual talk, but might be improper to use it in any formal text.

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Does 如果 sounds more formal when speaking? –  Cocowalla Feb 7 '12 at 19:42
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Sol Wood, do you mind adding examples so I can see how they work in actual sentences? –  Alenanno Feb 7 '12 at 20:19
    
Wrong, many modern literature/poem use 要是 in them. It might add some casual style but it is okay to use it in formal text. –  lamwaiman1988 Feb 8 '12 at 2:49
    
“如果” is fine to be used anywhere, but "要是",like I said, is more casual in tone, it's ok to use it in lyrics, speeches, or scenario, but you will never see that in a declaration, contract or treaty,etc. –  Sol Feb 8 '12 at 7:49

To me the biggest difference is "flavor". Sometimes I like the way one sounds, sometimes I like the way the other sounds. For example, I think if I were giving someone an ultimatum, I might use 如果 because to me in that situation it sounds stronger and more consequential, whereas 要是 might feel weaker or more matter-of-fact (if you do this, such-and-such will happen). This might just be my own personal preference - I'm not sure if other people feel the same way or not.

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There is paper with 20 pages which described the difference between 如果 and 要是, but it is in Chinese. I don't have the time to translate it now. Must edit later.

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Yikes, 20 pages! A synopsis would be great when you get a chance :) –  Cocowalla Feb 8 '12 at 8:58

要是 might be translated, if, supposing. There is a "wish" element to this construction.

如果 also means, "if" (in case) as the OP postulated, in a strictly factual sense.

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Do you mind adding examples so I can see how they work in actual sentences? –  Alenanno Feb 7 '12 at 20:19

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