英语句型问题 （改为否定句和同义句转换）

英语句型问题 （改为否定句和同义句转换）
1、i have ever been to shanghai(改为否定句）
i have ______ been to shanghai
2 the environment in beijing has already changed(改为否定句）
the environment in beijing _______________________________________
3 look at the cloud .it seems that it will rain soon(同义句转换）
look at the cloud.it___________________rain soon
4 shanghai is the largest city in china（同上）
shanghai is ________ than ________________________________in china
5 my grandma hasn't taken the subway.my grandpa hasn't taken the subway,either.（同上）
my grandma hasn't taken the subway,______ _________ my grandpa
6 the population of china is 1.3billion.(同上）
__________ _________ 1.3billion people in china
7 china has sent shenzhou VII into space successfully(改成反意疑问句）
china has sent shenzhou VII into space successfully ________ _________