It seems like for some verbs (正)在 is used to indicate action in progress, but I have also encountered 着 for some, like 穿着. When should it be used, is there a rule to follow?
This is used for both actions in progress and things that are happening in present tense, such as "she is wearing a dress".
I sometimes equate this to the -ing suffix.
He (She) is wearing a suit and playing guitar
Help me look out for him (her) (at this moment)
See him carrying such a big thing
However, this is not used as -ing with actions as you would expect:
This is wrong:
The 着 here should be applied to the 游 i.e.
着 when used between two verbs signifies that the first action accompanies the second (main) action.