is not.
他的口语讲的很好,好象他是他是一个英国人并且在那边住了几年,但是事实上他不是.
as if从句用had been型虚拟形式:表示从句的动作先与主句的动作发生.例如:He looks as if he had been ill.
以as if引导的从句如果不是表示虚拟,而是表示可能的事实,则从句中的谓语动词要用陈述语气.
例如:He spoke English well as if he had been an Englishman and would have lived for serval years in Britain .Actually,he was.
was跟 spoke保持一致
这两题要注意区别哦.