因为
yīnwèi
I conj.
because; for; on account of
他没回家是因为你。 He did not go home because of you.
II cons.
1) 因为 A suǒyǐ B: because A therefore B
因为天快黑了，所以我要走了。 It's about to get dark, so I'd better take my leave.
2) 因为 A de guānxi: because of A
3) 因为 A ér V: to V because of A