1.They often celebrate their nation,s birthday.2.We ofter go

1。 They often celebrate their nation,s birthday。 否定句：They don't often celebrate their nation,s birthday。一般疑问句：Do they often celebrate their nation,s birthday?肯定回答：Yes, they do。否定回答：No, they don't2。 We often go home at half past five。否定句：We don't often go home at half past five一般疑问句：Do you often go home at half past five?肯定回答：Yes, we do。否定回答：No, we don't3。My friends sometimes speak English in the classroom。 否定句：My friends sometimes don't speak English in the classroom。 一般疑问句：Do your friends sometimes speak English in the classroom?肯定回答：Yes, they do。否定回答：No, they don't 再问： 1。Miss Li isn't in her sister's room。 She is at school。 2。 Class begin at eight o'clock。 3。 Where is your watch ? Let's look for it。 4。 There are ten departments in my college。 I'm in the Chinese Department。 5。 Do you have English Classes on Saturday evenings ? 6。 Do you study on Youth Day。 7。Where do you live ? I live in 21 Bridge Street in Nanchang。 把这些句子翻译成汉语 再答： 1。 李老师不在她妹妹的房间。 2。 8点开始上课。 3。 你的手表在哪儿？让我们一起寻找吧。 4。 我们大学有10个系（部门），我在中文系。 5。 你周六晚上有英语课吗？ 6。 你在五四青年节这天学习吗？ 7。 你住在哪儿？我住在南昌大桥街21号 望采纳！祝开心！