How to use 'If...unless...”

If如果and unless除非 do not usually appear in the same sentence as they have close meanings and are used in similar ways. Usually we use either 'if' or 'unless in a sentence.

However, to answer your question:. how to 'If...unless..." .
Here is an example:
If I were a chicken, unless my wings grew larger, I could not fly.
In this sentence If....unless are used to give two different but related conditions.

Try to contruct your 'If....unless...' sentence modelling my example.

2008-10-25 08:09:52 補充：
To 004 Akit,
Your attempt to model on a 'If...unless' is a good try. Well done!
I think crystal can also do the same.

to 005 Love u till the end
Even you have studied in London for those five solid years doesn't mean you can't be wrong. Spelling: all you's answer, sentance, sori. Grammar: I study in London for five solid years. Don't tell me the literate Londoners write like this.

I don't really agree with all you's answer. (sori)

But i have a few examples for your question. I did use If....unless in the same sentance before, In my essays or exam papers.

" If only i am in big trouble, unless i won't ask her for help"

" If all the boys in the whole world disappears, unless i won't go out with him"

I study in London for five solid years. And we all use sentances like this, so i don't think that is wrong. Hope this might help you.

It's a matter of logic. If and unless has exactly opposite meanings and they negate each other in one sentence. Besides you don't use two conjunctions in one sentence. (Conjunct = connect Conjunction:used to connect 2 sentences)
e.g.
If you don't do it, I get kicks.
<=>
Unless you do it, I get kicks.

I have some examples, i agree that there are not mean to be used together, they can only be in two sentences.

1- If you want to catch the trend, you need to buy MILK magazine, unless you have very strong fashion sense.

2- If you are seeing Mary later, you should take a shower now, unless you think she likes smelly men.

3- If you want to get up early tomorrow, you should go to bed now, unless you slept in the afternoon.

Both candidates pointed out the correct point - we do not use "if...unless" sentence structure.

Hi,

" if " and " unless" are often used in conditional sentences.
Since their meanings are not the same, we cannot combine them in a sentence.

Check out the following examples.

1) If you study hard, you will pass your exam.( high possibility)

2) Unless you use a thermometer, you WON't know when your chicken is done.
3) Unless you cook your chicken this way, you will have a tough chicken.
You will pass your exam( positive )
You won't know when your chicken is done (bad result )

You will have a tough chicken( bad result) .

_____The end_______

Ciao

十分可惜，好似没有这个用法的．

在本人的英语知识中未接触到，或者有吧，但本人再翻查过Ｌongman双解辞典，发现无论查　＂ＩＦ＂或者是＂ＵＮＬＥＳＳ＂都查不到．