A subordinating conjunction is a is a type of conjunction that connects two parts of a sentence, making it more detailed. It links a main idea with a supporting idea. For example:
After he finished his work, he went for a walk.
Although it was raining, they went for a picnic.
She stayed at home because she wasn't feeling well.
If you finish your homework, you can watch TV.
Since it was getting late, they decided to leave.
These words like "After," "Although," "Because," "If," and "Since" connect sentences and help explain how they are related.
The main part of the sentence can stand alone, but the additional part needs the main part to make complete sentence (complete sense).
The question
what is Subordinating conjunction function sentence