They needed to ask someone for help.(改否定句)They ( )( )to ask ( )for help.Mrs.Green needn't worry about her son.He's safe.(同义句替换)Mrs.Green ( )( )( )worry about her son.He's safe.
问题描述：
They needed to ask someone for help.(改否定句)
They ( )( )to ask ( )for help.
Mrs.Green needn't worry about her son.He's safe.(同义句替换)
Mrs.Green ( )( )( )worry about her son.He's safe.
答
did't need
doesn't have to
答
1）they did not （写成缩写，咱打不出来）need to ask anyone for help
2Mrs.Green did not （原因同上）have to worry about her son.He's safe
答
didn·t need anyone
doesn·t need to