否则

否则：
用在后一分句前，前一句提出某种建议，要求或者估计，后一分句表示如果不能实现会有什么结果或者还有什么其他选择。
否则 is used at start of the second clause of a complex sentence. Th first clause will put forward some advice, instructions, or an estimation. The second clause will tell that if the first clause cannot be achieved for some reason, some results would occur or there may still be another choice.

例：你要尽早定旅行机票，否则到了旺季票价会很贵。
她一定还在生气，否则怎么会不跟你说话呢？

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