otherwise虚拟语气用法如下：
1、otherwise引导的短语或句子有时相当于一个虚拟条件句。假设的情况并不以条件从句表示出来，而是暗含在上下文中，通过介词短语来表示。
2、虚拟语气的用法一般是：对现在的虚拟：would+do；对过去的虚拟：would(not)+have done。
3、而should have done通常表示本来该做却没有做（表示后悔遗憾的感情）。
双语例句
1、You use otherwise after stating a situation or fact,in order to say what the result or consequence would be if this situation or fact was not the case.Make a note of the questions you want to ask.You will invariably forget some of them otherwise
在陈述一种情况或事实后，你可以使用其他方式，以说明如果这种情况或事实不是这样的话，结果或后果会是什么。记下你想问的问题。否则你总会忘记其中的一些
2、You use otherwise before stating the general condition or quality of something,when you are also mentioning an exception to this general condition or quality.The decorations for the games have lent a splash of colour to an otherwise drab city.
在陈述某事物的一般条件或质量之前，当您还提到该一般条件或品质的例外情况时，您可以使用否则。奥运会的装饰为原本单调乏味的城市增添了一抹色彩。
3、You use otherwise to refer in a general way to actions or situations that are very different from,or the opposite to,your main statement.Take approximately 60mg up to four times a day,unless advised otherwise by a doctor.
你用否则来泛指与你的主要陈述非常不同或相反的行为或情况。除非医生另有建议，否则每天服用约60mg，最多四次。
4、You use otherwise to indicate that other ways of doing something are possible in addition to the way already mentioned.The studio could punish its players by keeping them out of work,and otherwise controlling their lives.
你用otherwise表示除了已经提到的方式之外，还有其他方式可以做某事。工作室可以通过不让他们工作，或者控制他们的生活来惩罚他们。
5、You use or otherwise or and otherwise to mention something that is not the thing just referred to or is the opposite of that thing.It was for the police to assess the validity or otherwise of the evidence.
你用或其他方式或其他方式来提及与刚才提到的事物不同或与之相反的事物。警方应评估证据的有效性或其他方面。