Your are welcome. 你太客气了。 It is a long story. 一言难尽。 Between us. 你知，我知。 Sure thing! 當然！ Talk truly. 有话直说。 I'm going to go. 我這就去。 Never mind. 不要緊。 Why are you so sure？ 怎么这样肯定？ Is that so？ 是这样吗？ Come on, be reasonable. 嗨，你怎么不讲道理。 When are you leaving？ 你什么时候走？ You don't say so. 未必吧，不至于这样吧。