Punctuating Compound Sentences

Front

Does this sentence need a comma? It was raining in Kansas but it was sunny in New Jersey.

Back

Yes

Front

Does this sentence need a comma?

I liked dogs but I did not like cats.

Back

Yes

Front

Does this sentence need a comma? The alien wore a gown and a hat.

Back

No

Front

Does this sentence need a comma?

Our president lives at 1600 Pennsylvania Avenue and has a white house.

Back

No

Front

Does this sentence need a comma? Sam is the older brother and Thomas is the younger brother.

Back

Yes

Front

Does this sentence need a comma? I went to the store for I needed a carton of milk.

Back

Yes

Front

Does this sentence need a comma? He drove to the movie theater for the afternoon.

Back

No

Front

Does this sentence need a comma? They loved playing video games so I bought them a Nintendo Switch.

Back

Yes

Front

Does this sentence need a comma? Sam loved the rain so much that he threw his umbrella away and stood in it.

Back

No

Front

Does this sentence need a comma? Thomas wears glasses yet he couldn't see the elephant that stepped on his toe.

Back

Yes