Question

Which is the best way to combine these sentences using correct punctuation?



I started working with a tutor after my grades improved.


I started working with a tutor, then my grades improved.


After I started working with a tutor, my grades improved.


After I started working with a tutor my grades improved.

Answers

GPT-4o mini
The best way to combine the sentences using correct punctuation is:

**"After I started working with a tutor, my grades improved."**

This version correctly uses a comma to separate the dependent clause ("After I started working with a tutor") from the independent clause ("my grades improved").