Chinese Basic 2
Entertainment

因为 ... 所以

因为...所以 (yīnwèi ... suǒyǒu) is used to to provide a reason for something (because of ... therefore).

因为你请我吃饭,所以我请你看电影。
Yīnwèi nǐ qǐng wǒ chīfàn, suǒyǐ wǒ qǐng nǐ kàn diànyǐng.
'Because you invited me to dinner, so I invite you to watch a movie.'