急
1、they have already changed(否定句）
2、it seems that it will rain soon(同义句）=it ____ ______ rain soon
3 shanghai is the largest city in china
shanghai is ___ than_____ _____ ______ in china
4jim hasn't taken the subway.tom hasn't taken the subway,either
jim hasn't taken the subway___ ______,tom
5his mother came to cuba four years ago(同义句）