句型转换

71. Jack drove his car to school yesterday. （改为否定句）

   Jack _____ _____his car to school yesterday

72. Betty is not so slim as Helen. ( 同义句) 

Helen is ________ ________ Betty.

73. The man in a red T-shirt is Tom’s brother.（对划线部分提问）

________  ________ is Tom’s brother？

74. Tom bought a useful book last Saturday. (改为感叹句)

   ________  ________ useful book Tom boughtlast Saturday.

75.They didn’t have classes on December 31. They had a school party that day.（两句并成一句）   They had a school party ________ ________ having classes on December 31.