不然 1.(不是这样) not so; not the case; no 其实不然。 actually this is not so.2.(否则) if not so; otherwise; or else 我得早点去, 不然就赶不上火车了。 i've got to leave a bit early, otherwise i'll miss the train. 要去就别迟到, 不然, 就甭去了。 either be there on time, or don't go at all.3.(用于句子开头表示否定对方的话) no 不然, 事情没有那样简单。 no, it's not as simple as that
其实 actually; in fact; as a matter of fact; really; in reality; in truth 其实不然。 in fact that was not the case.其实他身无分文。 he is in reality penniless. 他看上去强健, 其实他的心脏很衰弱。 he appears to be strong and healthy, but, as a matter of fact, he suffers from a very weak heart