There are two sentences like : 1.The lights were on in every room. 2.We walked on in the forest, one behind the other. what situations do we make sentence using "on in" together? Thank you !
In the first sentence “on” is being used in the sense that the lights are functioning. In the second sentence, on is essentially shorthand for onward, meaning “continuing forward.” The second sentence should look like this:
“We walked on into the forest, one behind the other.” or
“We walked onward into the forest, one behind the other.”
The sentence using onward would be more correct, but the one using on would also be understood just fine.