as if ,if only, if ever分别什么意思谢谢!

我是来自新东方优能学习中心的老师陶然。1、as if=even though,引导虚拟语气从句,与if形式相同,可以翻成“就好像”。He looks as if he were an artist。2、if only 后面跟虚拟语气的句子。If only I were a flying kite。=How I wish I were a flying flying bird!翻译成“如果是……多好”3、If you ever visit London,you must come and stay with us。你要是到伦敦来,一定要到我们这里住住。还是if条件句,强调时间上“曾经,不论何时”祝你取得好成绩。