Combine the two independent clauses in each sentence using a comma and an appropriate coordinating conjunction (for, and, nor, but, or, yet, so).
Use a comma after an introductory participle or particle phrase
Use a comma after an introductory prepositional phrase or a series of introductory prepositional phrases
100

She loves painting. She doesn't have much time for it.

She loves painting, but she doesn't have much time for it.

100

Hoping to improve her skills the athlete trained every day.

Hoping to improve her skills, the athlete trained every day.

100

After the long day at work we decided to go out for dinner.

After the long day at work, we decided to go out for dinner.

200

I could go for a run this evening. I might stay home instead.

I could go for a run this evening, or I might stay home instead.

200

Fascinated by the stars he spent hours gazing at the night sky

Fascinated by the stars, he spent hours gazing at the night sky.

200

In the middle of the night he heard strange noises coming from the attic.

In the middle of the night, he heard strange noises coming from the attic.

300

She didn't see the sign. She parked in the wrong spot.

She didn't see the sign, so she parked in the wrong spot.

300

Convinced by her friends to join the competition she finally signed up.

Convinced by her friends to join the competition, she finally signed up. 

300

During the summer months the beach is usually crowded with tourists.

During the summer months, the beach is usually crowded with tourists.

400

The book was fascinating. It was also very challenging to read.

  1. The book was fascinating, but it was also very challenging to read.
400

Burned out from studying he decided to take a break and relax.


Burned out from studying, he decided to take a break and relax.

400

Before the big game they practiced their plays diligently.


Before the big game, they practiced their plays diligently.


500

He plays the guitar well. He doesn't perform in public.

He plays the guitar well, yet he doesn't perform in public.

500

Drowning in deadlines the student struggled to keep up with her assignments.

Drowning in deadlines, the student struggled to keep up with her assignments.

500

With great enthusiasm she accepted the job offer.

With great enthusiasm, she accepted the job offer.