一、注意避免连接词的重复。误:He asked that who could answer thequestion.正:He asked who could answer the ques-tion.【析】宾语从句和主句之间要有连接词,但只能用一个。误句中的 that 是多余的。二、注意连接词的位置。误:I don’t know this is whose book. First, pay attention to avoid the repetition of connectives. Error: He asked that who could answer thequestion. Positive: He asked who could answer the ques-tion. [Analysis] Object clause and the main clause between the connectives, but only one. Mistake in that is superfluous. Second, pay attention to the location of connectives. Wrong: I do not know this is whose book.