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Please, help me understand!
I want to know what native speakers actually use in moment when they want to start doing something immediately and want to say about it before starting.
What kind of sentences sound like?
For example, this sentences
now I'll show you a trick
now I will show you a trick
Now I am going to show you a trick
now I show you a trick
now I am showing you a trick
now I want to show you a trick
or
Now I'll sing you a favorite song
Now I will sing you a favorite song
Now I am going to sing you a favorite song
Now I sing you a favorite song
Now I am singing you a favorite song
Now I want to sing you a favorite song
is correct?
What is the difference between those sentences in this situation?
Comments  
Let me X. (asks permission, but doesn't always wait for it)

I'm going to X.

Now I'll X. (follows an earlier action)

Now I'm doing X. (in the middle of a continuing routine)
AvangiNow I'll X. (follows an earlier action)
I think " I will" means " I want to do it and I just decided to do it" but something may happen and I can't do it
"I am going to" means " I have already decided to do it, I intend or prepare to do it"
But when I have intended and 100% ready to do it, can I use present simple to emphase that?
Like "now I start X" or " I go there tomorrow"?
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Your right. Some of these expressions depend on context. I misunderstood your question as assuming you had the means at hand to begin the action immediately.
It's unnatural to say "Now" in most of your examples. I thought you merely used it to indicate that the action would begin immediately.

I'll / I'm going to lift the corner of the bookcase so you can put the rug under it.
(No need to say "Now I'll X." The speaker obviously intends to do it immediately.)

We'll / we're going to paint the house before we do the landscaping.
(This could take place anytime - an unspecified time.)

worker: Jack has been very rude to me lately.
boss: I'll speak to him about that.
(could happen anytime, or not at all)

"Now I start X" is unnatural, except perhaps as a line from an infomercial. In other words, you're describing the action as you perform it.

"I go there tomorrow" is okay. You're describing your schedule.
But you might be 100% committed to doing something at an unspecified time in the future. In this case, present simple would not be appropriate.
Well, that's all right.
But i asked about this simple situation.
I will do X and I decided to do X
I was going to do X and I intend to do it.
I'll start to do X exactly and immediately .
Can i say "I do X (now)" or I must repeat " I'll do X"?
for example, I prepared to go to work .
I dressed myself, went to the door and say:
'bye, I go to work"
or I must say "bye, I'll go to work"?
***
In Russian language we usually say "Пока, я пошел"
It is translated "bye, I went" but it means "bye, I'll go "
so we can say also " я уже иду" " я пойду" "я буду идти"
We can use all russian tenses in this case.
What is this in english?
tivitaWell, that's all right.
But i asked about this simple situation. Sorry. I guess I must be really stupid. I can't follow your simple situation. Could you condense it for me? Just give me the essence?

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Excuse me. I am russian speaker and we have 5 tenses at all in our languages. We think different...
I ask about that situation:
I want to declare about starting action, move, work , not about my intention and decision.
May I use present simple tense or future tense?

I prepared to go to work .
I dressed myself, went to the door
and i want say my wife about start my going just now. But I am not going, I am staying.
what I must say:
'bye, I go to work"
or I must say
"bye, I'll go to work"?
Thank You.



Sorry. I've tried to say simply that the present simple is not idiomatic in these cases.

Bye! I'm going to work!

Bye! I'm off to work!

Bye! I'm off for work!

Bye! I'm leaving for work!

Present simple is poetic only:

I fall upon the thorns of life, I bleed.

I've said twice that this works only in an infomercial. You're demonstrating something, and you explain as you do it.

Look! I throw soot all over the rug!
Look! I vacuum it up with the miracle vacuum!
Look! The rug is spotless!

Present simple also works for non-actions, like sensing and feeling:

I think I'll go to work now.

I feel sick.

I believe I'll have another beer. Emotion: beer

Future simple would only work with special context:

(making a choice)
Your cold seems worse today. Don't you think you should stay home? (reply) I'll go to work.
Thank you!
I understood.
Your information about using this form in an infomercial is very interesting and helpful.
And other information is very useful too.
I am grateful to you that you have answered me.
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