Can one use ''will'' after ''if'' in English sentences? In what cases? What do natives think ?
1 Close the door if it will help Peter to sleep.
2 I'll help to pay the course fees, if that will persuade you to apply to university.http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv315.shtml
Is it correct?

Question

Can one use ''will'' after ''if'' in English sentences? In what cases? What do natives think ?
1 Close the door if it will help Peter to sleep. 
2  I'll help to pay the course fees, if that will persuade you to apply to university.http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv315.shtml
Is it correct?

Answer

=> If x will do something, then y can happen.  
Yes, this is an acceptable pattern and can be used for any appropriate context.

- If rain will help the crops grow better, then let's pray for rain.

Answer

Sure. That is OK. 
Here are some examples:

- I will buy those tires if they will fit on the wheels of my car.
- I'll take the medicine if you think it will help me feel better.
- I built this shelf, but am not sure if it will hold heavy objects.

Answer

http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv315.shtml 
Is it correct?

Answers · 3

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