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Hi teachers,

Can I say like this:?

a/How many years'experience do you have of teaching English?
b/How many years'experience do you have in teaching English?
c/How many years'experience do you have teaching English?

I have over 20 years' experience/over twenty- year experience of teaching English?
I have over 20 years' experience/ over twenty- year experience in teaching English?
I have over 20 years' experience / over twenty- year experience teaching English?

I have over 20 years of experience of teaching English?
I have over 20 years of experience in teaching English?
I have over 20 years of experience teaching English?

Thank you very much in advance
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The 'of' construction sounds slightly irregular to me, although I can't tell you exactly why. The others are fine. [Perhaps it's just too close to the other 'of'.]
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Thank you Philips,
Can I say "How many years' experience do you have of / in teaching English ?

Best wishes
TuongvanCan I say "How many years' experience do you have of / in teaching English ?
Best wishes
Looks fine to me.
TuongvanI have over 20 years' experience teaching English?
This is an interesting sentence. I just found a similar one from one of my books and I am not quite sure how to understand it.
On the basis of my dictionary I would like to use either of or in with that sentence but not without both of them.
Can somebody tell me how the -ing form of teaching is used in this sentence? Is it used in the similar way like in the following sentences:

Who's the girl dancing with your brother?
Putting down my newspaper, I walked over to the window.
Judging from his expression, he's in a bad mood.

Or is the sentence I have over 20 years' experience teaching English just an informal way (of or in dropped) to say the same thing like the one with prepositions.

Thanks