I am having problem with gerund and verb.i fail to draw a clear distinction between the both.suppose
if i say,
1.as in the dictionary it is written that after "proud of" it takes sth(noun).
(a). now which one is true:i feel proud of (walk) or (walking)as both the words are nouns.so how can one make difference to use which one.
(B) he is famous for (running fast) (run fast) as after famous we can use noun not verb.
(c)in some cases ,there are not as such nouns .like throw,hurl,send
and if we add ing to them they will become noun.then are the following sentences correct
(1) the throwing of stones by Muslims at the devil,or satan.
(2) the spreading of the Islam across the world.

i am asking to all of you as many of teachers have failed to answer my questions.provide each detail regarding these question.
\ thanks

I don't know much about grammar but if I were to use these sentences, I would use them in the following manner.
I'm proud of walking.
He is famous for running fast.
Walk or walking are both verbs in my opinions. They are not nouns. They are actions rather than the names of place or person.

@umer
thanks umer for replying me ,
actually .my question was rather simple that after proud of and famous for.we are bound to use only nouns,but you have used verb with -ing.that is not allowed atleast after these prepositions. i have presented this question on this forum as by now i have got no satisfactory answer from anyone.

Dear have a look at following two sentences:

Walking barefooted can be dangerous...
I was walking on road when a car struck me..

So dear it is simple to find out that Walking in first sentence is Gerund while walking in second sentence is a verb...
How to distinguish between these two?
The function of each will clarify the doubts, i hope you can identify which one is noun and which is verb...
Now whenever you see that an ING form is used and where it has been used is the place reserved for a noun, then you know that this is a gerund as Gerund is a noun basically, and whenever you see that an ING form is used where a verb should be, that is it..you know the difference now.you got it?

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But when love is one sided, holding off is no more an option.

thanks bilal bhai
so, i can conclude that following sentences are correct

he is famous for running fast.
he is proud of walking.although after both the prepositons,there is no room for verb+ing.so the above ing words be considered gerund noun.am i correct..

Exactly boy...you got it...

__________________
Ever has it been that love knows not its own depth until the hour of separation.
But when love is one sided, holding off is no more an option.

but bilal bhai if we use gerund after these prepositions
they should be in this manner.
he is famous for (sth ,as in dictionary,that sth should be noun)running fast will be verb.how do you explain it

Dear if we take into account your sentence then running fast is a gerund, as famous here is the attributive use of Adjective, so it must precede the noun for which it is a qualifier...so running fast is not a verb dear...it is a noun i-e Gerund.....
As you know that verb signifies an action, as we see in your sentence, no action is seen so running fast cannot be a verb...
One more thing, it is not written anywhere that prepositions are followed by verb, the prepositions are usually followed by noun or adjective...

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Ever has it been that love knows not its own depth until the hour of separation.
But when love is one sided, holding off is no more an option.

Until you clarify your concept about "gerund" you will go on confusing it with Verb. You need to understand ,first, what the Gerund is.

The -ing form of the verb (called Present Participle Form) sometimes also works as a Noun and Adjective. That is to say that "writing" may be working as a Verb, Noun or Adjective in a sentence.

-ing form when used as Noun is called a "Gerund". It is also referred as Verbal Noun ( It looks like Verb but does the work of a Noun)

The Gerund can be used as Subject, Object, Subject Complement or Object of Preposition. ( I'll put the example if you ask for)

As for the sentences you mentioned,
=>I am proud of walking.
=>He is famous for running fast.

The underlined word are doing the work of a Noun and these are object of prepositions of and for. There are certain prepositions which are followed by Gerund(Verbal Noun).

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@siddiqui 88 and bilal hassan.
indeed, i am highly indebted to both of you.you guys have taught me this concept very clearly.now i am posting following sentences i have made after understanding it.mark true and false.
1.X is famous for throwing his books into the river.
2.he is famous for being rude .
i suppose first sentence might be wrong.
secondly,we can use ing form as an object of every preposition.