What many scientists believe is that the earth is round … Who will take part in the meeting has not been decided. Whoever breaks the law will be punished. Which student will win

　　is uncertain. Whatever was said here must be kept secret.

　　这里说的话都应当保密。

　　Whoever makes mistakes must correct them.

　　凡犯了错误的人都必须改正。

　　3)连接副词when，where， how， why等。 Why they suddenly disappeared still remains a mystery. When they will leave is not decided. Where she is from is unknown. How we will paint the house has not been decided.

　　注意: 1）主语从句在句首时，必须由连接词引导，不能省略这些连接词；但是如果用it做形式主语，而把主语从句放在句末时，从属连词that可以省略。 误：They should like each other is natural. 正：That they should like each other is

　　natural. 正：It is natural (that) they should like

　　each other. 2)如果主语从句放在句首，不能用if引导，但是如果用it 做形式主语，而把主语从句放在句末时，也可以用if引导. 或把if 改为whether

　　误：If Mary really heard him is really doubtful. 正：It was doubtful if Mary really heard him. 正: Whether Mary really

　　heard him is really

　　doubtful.

　　Complete the sentences using what, whether, where,

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