phr. because..., therefore,...
phr. Because I was afraid, I didn't go (there).
phr. This is our first lesson, so I don't know your names.
phr. I like summer because I can swim in the sea.
phr. I am upset today because I've failed in the exam.
phr. He is so busy that he has kept working for a whole year without any holidays.
phr. The court will reduce the punishment, considering the circumstance that he is still underaged.
phr. the reason why...is...
phr. Because the cat was late, (he) was not chosen.
phr. Because of the rain, he did not go to play football.