Chuyển những câu sau từ câu trực tiếp sang câu gián tiếp

Chuyển những câu sau từ câu trực tiếp sang câu gián tiếp :
1.The policeman said:"the bus was here 5 minutes ago".
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2.He said:" I and my family may go go home on this nextweek".
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3.She said:"When he came, I was doing my homework".
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4.Nga said:" I have just finished doing my work".
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5.My brother said:"You must finish your work before I comeback".
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