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What is the difference between the two below?

I leave/go now.
I'm leaving/going now.
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Comments  
The versions with the progressive are far more likely.
There is no difference in meaning?
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As 'now' in this sentence suggests 'at this moment, then it is difficult to think of contexts in which the present simple could be natural.
Then what about these?

Let's go/leave now.
Let's be going/be leaving now.
TakaThen what about these?Let's go/leave now.Let's be going/be leaving now.
The non-progressive bare infinitive is probably more likely.

In this utterance "now" is probably marginally less immediate. - ''let's" tells us that the going/leaving' is not happening at the moment of speaking.
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Related question.

Do you think these are exactly the same in meaning?

The train is leaving this station at 6 p.m.
The train leaves this station at 6 p.m.
The train will leave this station at 6 p.m.
TakaRelated question. Do you think these are exactly the same in meaning?The train is leaving this station at 6 p.m.The train leaves this station at 6 p.m.The train will leave this station at 6 p.m.
No, they do not have exactly the same meaning, although they refer to exactly the same situation.
Then could you kindly explain what the difference is?
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