Here are the corrected sentences using either a conjunction or a full stop:
Jenny ate her dinner quickly she had a lot of homework to do.
*
Correction: Jenny ate her dinner quickly
because she had a lot of homework to do.
*(You could also use a full stop: Jenny ate her dinner quickly. She had a lot of homework to do.)*
Jack played basketball with his friends they had a great time.
*
Correction: Jack played basketball with his friends
and they had a great time.
*(You could also use a full stop: Jack played basketball with his friends. They had a great time.)*
The dog barked loudly it wanted to go for a walk.
*
Correction: The dog barked loudly
because it wanted to go for a walk.
*(You could also use a full stop: The dog barked loudly. It wanted to go for a walk.)*
Tom likes to swim in the pool he is a strong swimmer.
*
Correction: Tom likes to swim in the pool
because he is a strong swimmer.
*(You could also use a full stop: Tom likes to swim in the pool. He is a strong swimmer.)*
The sun was shining brightly it was a beautiful day.
*
Correction: The sun was shining brightly
and it was a beautiful day.
*(You could also use a full stop: The sun was shining brightly. It was a beautiful day.)*
Final Answer:
1. Jenny ate her dinner quickly
because she had a lot of homework to do.
2. Jack played basketball with his friends
and they had a great time.
3. The dog barked loudly
because it wanted to go for a walk.
4. Tom likes to swim in the pool
because he is a strong swimmer.
5. The sun was shining brightly
and it was a beautiful day.
Parent Tip: Review the logic above to help your child master the concept of correct sentence worksheet.