'I didn't know if my eyes (will) ever heal'

Hi,

Is it correct to say/write:
I didn't know if my eyes ever heal?

P.S
I'm in a conflict --->  Does it sound natural?

Your tenses seem wrong. Please provide a context or scenario in which you would say this. That way, we can see what you mean by this.

Best wishes, Clive

Hi,

Yes, could or would. Probably would.

Clive

Hi,

It appears so.

I don't know if it will rain.

I'm afraid to propose to Mary because I don't know if she would marry me.

Is there some special type of sentence that you are thinking of?

Clive

Hi,

I thought that will and would(future) mustn't follow the word if.

eg I'm afraid that if I propose to Mary, she'll say no.

Yes, don't use 'will' to refer to the future with 'if', as your example shows. And don't say things like 'If I would become King, I would do this ....'

However, here are some places where you can use will/would, so don't say 'mustn't.

If you will wait for a moment, Mr. Smith will soon be able to talk to you. (politeness/willingness/request)

I want to know if you will call me tonight. (indirect speech, where 'if' is like 'whether'.)

Tell me if it would be quicker to go by plane. (indirect speech, where 'if' is like 'whether'.)

If you will make you happy, I'll stop smoking. (the 'if ' clause is seen as the 'result' of the main action.)

For a fuller discussion of these aspects, have a look at Michael Swan's 'Practical English Usage'.

Best wishes, Clive