根据所给单词，写出下列句子的同义句。(18分)
for，do，English，bag，class，does，yours，an
（1）Is it your bag?
Is that ________ ________？
（2）What's your father?
What ________your father ________？
（3）It's time to have an English class.
It's time ________ ________ ________ ________．