TOS: When Jill came to town, we all celebrated, for we knew she would be the life of the party.

TOP: My first experience traveling alone to a new city was a transformative journey, one that taught me the importance of self-reliance and resourcefulness.

IC: Megan drove to her mother's house although it was late.

TOS: Even though Marcos was in love with her, he was unable to express himself; it was no surprise she left him.

TOP: The bustling city street was a symphony of sounds, from the honking of taxis to the chatter of pedestrians and the melodies of street musicians.

Proofreading error: P.E is most students favorite school subject; they wish they had it every day.

TOS: She'll agree to cooperate if you help her too.

IC: Because it was cold outside, I had to wear my coat

When writing a complex sentence, commas are mandatory to join clauses.

IC: I’ll try not to fall asleep until I get your text.

TOS: Maria registered for all of her classes by mail; Brad was not able to do so.

TOS: Although it was late, María still tried to save her relationship.