Don't combine if with would . 1b is wrong. Otherwise, OK.
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Cool BreezeEven 1b is grammatically correct. It is normally all right to combine if with would when if does not express colorless condition. In your sentence even if could be replaced with even though. More examples of if and would in the same clause:
If you would kindly wait a minute, I'll call Mrs Smith.
You
CalifJim.Hi CJ
(I saw no reason for suggesting to the original poster that volition and shaking should go together, which can only confuse, as he is obviously working out the (single, acceptable) answer expected in a class exercise.
CJ
Cool BreezeHi CJI agree. Only saying "
I understand that full well. It's just that if you say to the original poster that sentence 1b is wrong, he may take your words at face value and think it really is ungrammatical.
You would learn it if you would try = You would learn it if you just wanted to make an effort.
Cheers
CB