i think it's his 变否定句

i think it's his 变否定句 I think it's far from his home to school改为否定句 I think it's Gary's改为否定句 I think it's Tom's如何改成否定句 I think it's boring的否定句 He thinks it's boring的否定句 I think it's an exciting movies.(改为否定句) I think it\'s exciting的否定句 I think it's her baseball 改否定句 I think it's a quiet street 改为否定句 I think it's exciting.（改为否定句） I think it is his pen.(改为否定句） I _______ _____it_______his pe i think there's something interesting in his story改为否定句怎么改 ,