I sometimes see or hear "It is that ..." sentences as the following:
(1) "It's not that I don't want to support you. It's just that I don't know how."
I'd like to know if "It is that ..." sentences can give an explanation to a non-linguistic context. For example, how about (2)?
(2) [Context: The speaker coughs badly, and the hearer watches him/her with an anxious look.]
"It's not that I'm sick. It's just that the water went down the wrong pipe."
I apologize if my English isn't very good.
Thank you.