这个周末他们去爬山
肯定句：They will go to climb mountain this weekend .
否定句：They won't go to climb mountain this weekend .
一般疑问句：Will they go to climb mountain this weekend ?
肯定回答：Yes ,they will .
否定回答：NO,they won't.
他正在发电子邮件
肯定句：He is sending e-mails.
否定句：He isn't sending e-mails.
一般疑问句：IS he sending e-mails?
肯定回答：Yes, he is .
否定回答：NO,he isn't.
她每天读报纸：
肯定句：She reads newspaper every day.
否定句：She doesn't read newspaper every day.
一般疑问句：Does she read newspaper every day ?
肯定回答：Yes,she does.
否定回答：No,she doesn't.