2

Such as :

 does staring at this will hurt my eyes? 

 does teaching will make me more patient? 

Is it that we can use only one helping verb in a verb phrase?

I am not technically sure, but the sentences appears and sounds better with "will" omitted from the above examples.

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  • You can definitely follow "does" with a verb. "Does falling down the stairs count as an accident?" "Does staring at the sun hurt your eyes?" However, I can't think of an occasion where "will" would fit. – Dave M Oct 17 '14 at 15:20
  • Two helping verbs can be used in some grammatical English sentences, but not do and will. – Peter Shor Oct 17 '14 at 16:30
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You should use one or the other, not both. The implications are different, also.

Will staring at this hurt my eyes?

"If I do this, will it have these consequences?"

Does staring at this hurt my eyes

"I do this. Is it the cause of my eye pain?"

Your version is not grammatically correct.

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The rule you need for questions is:

If there's an auxiliary verb put it in front of the subject to make the question. If there's no auxiliary, put DO in front of the subject to make the question. Don't use DO if there's another auxiliary.

does staring at this will hurt my eyes?

does teaching will make me more patient?

The subjects in your sentences are staring and teaching. The auxiliary you should have is will (if there's another auxiliary, we never need DO!). To make the question we move the auxiliary in front of the subject like this:

  • Will staring at this hurt my eyes?
  • Will teaching make me more patient?

[There are some special questions called subject questions, which are different. You don't need to worry about those - because students almost never make mistakes with subject questions!]

Hope this helps!

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