Can someone tell me:
What is the difference between go on to do,go on doing and go on with?

Any help will be appreciated!
"Go on to do" is usually used in a narrative, describing two different time frames.

Jack spent many of his early years behind bars, but he would go on to become a famous preacher.

The other two are sometimes used interchangeably, but "doing" most often refers to a task or routine.

"After The Simpsons, go on with / doing your homework."

When Jack died I didn't think I'd be able to go on with my life. (continue)

Yes, we've lost our best man, but we must go on with the game.

If you just go on doing it the same way, all the parts you make will have to be scrapped.

I'd like to go on making easy money, but I'm afraid it's over.
many thanks!
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Hi,Avangi,thank you for so quick reply!
What is the difference between go on doing and keep on doing?

They're often used interchangeably.

I think in general, "go on" would be used following an interruption involving some question about continuing, while "keep on" would simply mean to continue.
can you say me the difference detween go and to when they have a verb ending in ING when thay`re not a verb
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Perhaps you're thinking of three or four different forms of the same verb. We call it a verb when it's the main verb in a sentence or clause. otherwise we call it a verbal.

Examples of verbals are participles and infinitives. sometimes they work alone, and sometimes they serve as the head of a phrase. The infiinitive often has a "to" in front of it, but not all words with "to" in front of them are infinitives.

There are a couple types of participles: present participles ending in "ing," and past participles usually ending in "ed."

I run every day. She ran to the store. He is running to the store. She will be running in the Marathon. He is going to run in the Marathon. She is going to be running in the Marathon. These are verbs. Go is sometimes used in forming the future tense. And the present participle (-ing) is used in forming some of the tenses.

I want to run in the Marathon. I like to watch races. These are verbals - specifically, they are infinitives. (The verbs in these sentences are "want" and "like.")

I love running on the beach. I like watching the girls at the beach. These are "ing" verbals. (The verbs in these sentences are "love" and "like.")

Notice that the "to" form and the "ing" form may often be swapped with each other in this kind of sentence.