Because I have a headache.

WRONG SENTENCE #1

C O R R E C T :

RIGHT SENTENCE #1

RIGHT SENTENCE #2

Because I have a headache, I am going to take a nap.

WRONG SENTENCE #2

RIGHT SENTENCE #3

I was stuffed after eating three cheeseburgers and a plate of French fries at lunch with my friends at Heavenly Hamburgers.

I have talked with some of the students working in Professor Espinoza's laboratory last semester.

WRONG SENTENCE #3

After eating three cheeseburgers and a plate of French fries at lunch with my friends at Heavenly Hamburgers.

Some of the students working in Professor Espinoza's laboratory last semester.

W R O N G :