I have read the following links and have a question similar to them:

[All we seem to do is argue or is arguing][1]

[“All you have to do is read” vs. “All you have to do is to read”][2]

["What I have to do is" + verb inf][3]

[What form of verb should expressions like "All I want to do is" be followed by?][4]


Based on these links, I suppose the sentence:

> 1) "All I do lately is listen to music".

is right, and the sentence:

> 2) All I do lately is listening to music.

is wrong.

But what about these:

> 3) "All I am doing now is listen to music".

> 4) "All I am doing now is listening to music".

Does the present continuous form of the verb ("doing") makes the phrase coming after "is" to be a gerund?

Maybe the original form of this sentence is 

> 5) "All I am doing now is **[I am]** listening to music".

Where **[I am]** is omitted so it is reasonable that the present continuous form of the verb ("doing") propagates to the phrase after "is".

What ever the answer is, can I generalize the answer to all the following expressions?

> 6) What I have been doing lately is study/studying.
> 7) The work that I have been doing lately is draw/drawing a painting.
> 8) The dream that I am thinking about is go/going on a trip.



  [1]: https://ell.stackexchange.com/questions/176647/all-we-seem-to-do-is-argue-or-is-arguing
  [2]: https://english.stackexchange.com/questions/104546/all-you-have-to-do-is-read-vs-all-you-have-to-do-is-to-read
  [3]: https://english.stackexchange.com/questions/106058/what-i-have-to-do-is-verb-inf
  [4]: https://www.quora.com/What-form-of-verb-should-expressions-like-All-I-want-to-do-is-be-followed-by