Lesson Four

because / because of

Because” and “because of” are used to give reasons or to indicate the source of a situation. They answer questions asked with the word “why.”

“Because” is used with clauses. “Because of” is used with phrases and, sometimes, single words.


He’s starting to get nervous because he has so much work to do and not enough time to finish it all.

(A subject and a verb come after “because.”)

at work

He’s feeling a lot of stress because of his job.

(“Because of” is part of a prepositional phrase.)

at work
What is a prepositional phrase?

 The World Trade Center fell down because it was attacked by terrorists.

(“…it was attacked by terrorists” is a clause. Subject = it; verb = was attacked)

world trade center

The World Trade Center fell down because of a terrorist attack.

(“…of a terrorist attack” is a prepositional phrase.)

world trade center

I make a lot of mistakes spending money in other countries because the money is so different.

I’m not sure how to spend money in other countries because of the value of the currency.

Because the world climate is changing, polar bears are in danger of becoming extinct.

(It’s okay to begin a sentence with “because” if you are making a complex sentence.)
polar bear
Because of climate change, polar bears are facing extinction.
polar bear


You can find more examples for the preposition “because of” by clicking here.

Next: Lesson Five

due to