根据combine..and/with...把...与...结合起来,combine against为反对.而结合“这两

eg：让我们两家公司联合起来,对付我们的竞争者
（ Combine ）our two company ( against ) our competitiors
eg:总之,理论应该与实际相结合
In short,theory should ( combine with ) pracitce
3.ever before、ever since、ever after这三个短语分别是什么意思?
ever before 从前 She is happier than ever before.她比过去任何时候都幸福.
ever since 自此以后 Mr brow has looked unbeatable ever since the first found.布朗先生自从第一回合之后就已经看起来是无敌了.
ever after 从此以后一直 The prince and the princess lived happily ever after.
从此以后王子和公主就一直过着幸福的日子.

1.Conbine;against 2.be combined with 3.理解before,since,after的意思就好，ever只是“在任何时候；在某时；有时；偶尔等”主要用于加强语气