“To sit waiting” vs. “to be sitting waiting”

Question

• I'm sitting waiting for a bus.
• I sit waiting for a bus.

There is the situation that I'm sitting on a bench and I'm waiting for a bus in a bus station.

If I want to tell my friend that by a phone. I say "I sit waiting for a bus." It is right?

Somewhere, I have heard "I'm sitting waiting for a bus" means that I'm sitting up and down (it doesn't mean an exercise) while waiting a bus, as a bus has arrived. Therefore Someone tell me you would use I sit waiting for a bus.

Simply, I think I'm sitting + I'm waiting = I'm sitting waiting.

How are the two sentences different?

also

• I sitting waiting for a bus.
• I sitting and waiting for a bus.

differ?

Answer 1

In this case the am is required, as it shows that you are in the process of sitting and waiting for the bus.

I am sitting, waiting for the bus

The sentence is made up of two clauses:

I am sitting, waiting for the bus

or

I am sitting and waiting for the bus

Both are equally acceptable as it is a matter of connecting two seperate clauses, either by means of a , or an and.

On the matter of your use of

I sit waiting for a bus

it is not incorrect, per se, but it wouldn't be used by a native speaker; it is passive, and one expects a while after it, and for it to be written not spoken. Instead I would suggest:

I'm waiting for the bus

simply for authenticity.