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Hello

is it correct to say:

when using
when to use
when one uses
when it is used
i m going to your place when he calls me
when deciding something like this issue...

this When is used sometimes as a conditional, is there any rule to use the present tense or should i use the future one?

how to decide when using (to use?) -ing ? is this When functioning as an adverb or as conjunction
can i use it as a conector and if so how to do it?

Estela
Comments  
What a lot of questions!

These are correct:

When using a gun, never point it at you mother.
When one uses a gun, one should never point it at one's mother.
When it is used, a gun often recoils.
When used, a gun often recoils.
When to use a gun is a police officer's most difficult decision.
When deciding something like this issue, never use a gun.
I he has a gun, I'm going to your place when he calls me.

Other uses may or may not be correct.

I cannot imagine a conditional 'when'-- can you give me an example? These are not conditional:

When I am angry, I use my gun.
When I was angry, I used my gun.
When I am angry, I will use my gun.

'Whenever' may be considered a form of conditional:

Whenever I am angry, I use my gun. (timeless)
Whenever I am angry, I will use my gun. (future)
Whenever I was angry, I would use my gun. (past)

If you have further questions, would you like to refine them, Estela?
These are correct:

When using a gun, never point it at you mother.

Actually, it is correct but probably not what you intended, eh, Mr M?
<<<<<<<<<<<<<<<<<<<<<<<<<<

Mr M: I cannot imagine a conditional 'when'-- can you give me an example?

When you shoot a gun, does it make much noise?

"Note that for both generic and habitual conditionals it is possible to substitute when or whenever for 'if' and still express more or less the same thing."

When/if/whenever you boil water , it vaporizes.

{The Grammar Book, p549}
Site Hint: Check out our list of pronunciation videos.
Oops, dropped my 'r' around here someplace-- don't anyone move!

My gun always makes a lot of noise when I shoot it, JTT. It's an old nickle-plated US Army issue Smith & Wesson .38 revolver.
thanks

when by if, that was the conditional use of when i was talking about and I still have further questions, but i dont know if i can refine them mister micawber, but im going to ask again what i asked first and that i still dont know:
when do i have to use -ing ending verb after a When
when do i have to use the infinitive form of a verb after a when

Estela
Please capitalize your 'I's and consider the use of more punctuation. Your questions are more difficult to interpret than they should be, given your level of English ability.

It seems to me that 'ing' forms are used with clauses simultaneous activities

'When using a knife, keep your thumbs back.'--

And that the infinitive is used in noun clauses--

'When to use a knife is problematical.'

But there may be more to it than that.
Students: Are you brave enough to let our tutors analyse your pronunciation?
thanks Mister Micawber, no further questions.
Please consider the use of kindness as my capitalized I will consider the use of punctuation.

Estela