otherwise虛擬語氣用法如下：
1、otherwise引導的短語或句子有時相當於壹個虛擬條件句。假設的情況並不以條件從句表示出來，而是暗含在上下文中，通過介詞短語來表示。
2、虛擬語氣的用法壹般是：對現在的虛擬：would+do；對過去的虛擬：would(not)+have done。
3、而should have done通常表示本來該做卻沒有做（表示後悔遺憾的感情）。
雙語例句
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
在陳述壹種情況或事實後，妳可以使用其他方式，以說明如果這種情況或事實不是這樣的話，結果或後果會是什麽。記下妳想問的問題。否則妳總會忘記其中的壹些
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.
在陳述某事物的壹般條件或質量之前，當您還提到該壹般條件或品質的例外情況時，您可以使用否則。奧運會的裝飾為原本單調乏味的城市增添了壹抹色彩。
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.
妳用否則來泛指與妳的主要陳述非常不同或相反的行為或情況。除非醫生另有建議，否則每天服用約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.
妳用otherwise表示除了已經提到的方式之外，還有其他方式可以做某事。工作室可以通過不讓他們工作，或者控制他們的生活來懲罰他們。
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.
妳用或其他方式或其他方式來提及與剛才提到的事物不同或與之相反的事物。警方應評估證據的有效性或其他方面。