Grammar Present simple or present cont.

He is working on Tuesday, but I don't know when he finishes/ will finish.

Both are OK, but native speakers usually use present for future in such dependent clauses. Notice that you used a present verb form for future in your first clause also.

Mister Micawber He is working on Tuesday, but I don't know when he finishes/will finish.

I'm curious to understand why you have used continious(... is working ...)

In my opinion, it should be correct to write:

He works/will work on Tuesday, but I don't know when he finishes/will finish

I suppose that as th

Well, in fact I used continuous because layla did, but nevertheless, it is a perfectly fine future verb form and works well in layla's sentence. Present continuous is commonly used for arrangements in the near future. It has nothing to do with continuous action.

Your #1 and #2 are also acceptable forms.

Thank you for your answer

As I understood the Present Continious as well as the Present Simple can be used to express smth. in the future in Simple sentences.

The Present simple is usually used to inform about future movement processes(to leave, to start, to come, to return)

He arrives London on Monday

We return home tomorrow

The Present Continious is used to express

Well, your 3rd example ('I'm going to win') is a third, different future form, and using other future forms in your definition for the present continous ('will happen', 'is going to do') also clouds the issue. I don't think that present simple is particularly connected with 'movement processes', since the same verbs appear in continuous as well. Here are some quick, rough definitions for these f

I thought that present simple is connected with 'movement processes' as it isn't used in other cases to express the future(but I'm not sure).

They will buy a new car soon - correct

They are buying a new car soon - sounds good

They buy a new car soon - seems to be mistaken

The steamer sails tomorrow - should be correct

I have never heard of 'movement processes', nor do I know what you mean by that. Perhaps you can explain in light of these two sentences:

They buy a new car soon -- This sounds odd.

He takes his examination on Monday -- This is good.

The problem is that I learned the very specific English(we call it 'Moscow English' or 'RusEnglish') so that there is nothing to wonder that I use terms like 'movement processes' or 'Present Indefinite Tense'...

Our teachers taught us that we may use 'Present Indefinite'(Present Simple) to tell about something in the future but they said it is correct only with verbs that express movement

Just be careful of the prescriptions of RusE. This is the first time I have knowlingly met with it. It may contain some other anomalies.