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2017年6月大学英语四级语法考点:表语从句
表语从句出现在结构为“主语+系动词+表语从句”的句子中。表语从句除可用that,what,when,why,whether,how等引导外,还可由because,as if(though)等引导。that常可省略。如主句主语为reason,只能用that引导表语从句,不可用because.
Perhaps the most important thing to remember is that there is no one common type of life in America.
The reason why so many people died there is that there were not enough food supplies.
It looks as if successful international cultural communication will make the world smaller.