Question

It's so hot. He turns on the air-conditioner (so)

--->

Answer 1

It's so hot. He turns on the air-conditioner (so)

--->It's so hot so He turns on the air-conditioner

Answer 2

It's so hot. He turns on the air-conditioner (so)

--->It's so hot so he turns on the air-conditioner

Answer 3

It's so hot. He turns on the air- conditioner (so)

---> It's so hot, so he turns on the air-conditioner.