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First Conditional

I want to appreciate Moderator David and other contributors on this resourceful site. God bless you real good.


I was planning a lesson on conditional sentences and I got this from page 748 of 'Cambridge Grammar of English' by Ronald Carter and Michael McCarthy: 

"The structure of the first conditional is: if + present simple tense + modal verb with future reference (e.g. will/shall/may).

In the first conditional, a speaker or writer predicts a likely result in the future if the condition is fulfilled. There must be at least some chance of the condition being fulfilled:

If Sally comes too, there’ll be five of us.

We won’t have enough time if we want to do some shopping too.

✪ 'Will' and 'shall'  are used in the main clause, not the if-clause:

If he moves to Manchester, he will have to sell his house in Bristol.

(If he will move to Manchester, he will have to sell his house in Bristol.)

I know that it is wrong to use 'will' in the if-clause like the last example given by the authors. But I'm not sure if this applies to all situations. 

I'd like to know if these examples are wrong: 

1. If comedian AY will perform at the show, I will definitely attend. 

2. If you won't tell Dad about it, I'll show you the tattoo on my butt. 

3. If Ronaldo will play in tomorrow's match against Liverpool, I will buy a ticket to watch the game. 

If they are correct, what is the difference between them and the last example I quoted from CGE? This confuses me. How do I know when not to use 'will' in a conditional clause.

Thank you in advance. 



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