Ask students to study the two groups of sentences and try to find out something different. If they can’t find out , the teacher can tell them that that the sentences use different speeches. One is direct speech and the other one is indirect speech/ reported speech. If we use direct speech , we often use quotation marks. For weaker classes, we teachers use Chinese to tell them. 直接引语是直接引述别人的原话,原话用有引号,而间接引语是引述别人的话,不用引号。间接引语在多数情况下构成宾语从句。