Long and short actions

[Rachel Adams]

Hello.
This exercise is also from "Macmillan English Grammar in Context" by Michael Vince. The progressive was used only in b, j, and p. Is it because they are longer actions? It was mentioned in one of my books that in comments the progressive is used for longer actions.

 

[Charlie Bernstein]

I don't see a b, j, or p.

Yes, the progressive is used for continuing actions.

 

[Rachel Adams]

I don't see a b, j, or p.

Yes, the progressive is used for continuing actions.

There are "He is walking", "He is standing", and "He is sitting."

 

[Charlie Bernstein]

Then you're probably right.

 

[Tdol]

It seems a bit of an oversimplification to me.