becuase or because of

[pamela baquero]

when do you use because or because of?

[rincui]

After "because" is a clause:

eg: Because his leg has been broken, he can't walk.

After "because of" is a phrase:

eg: Because of his broken leg, he can't walk.

[Fazzu]

I think 'because' can also be used in sentences which has no clauses.
For e.g.
A: "Why didn't you come to school that day?"
B: "Because I was having headache".