1. The students are in the classroom now. (改为否定句)

The students             in the classroom now.

2. I went to bed at eleven last night.(对划线部分提问)

                                        you go to bed last night?

3. They spent several years building this railway. (改写句子,句意不变)

                                        several years to build this railway

4. Do you know my address?” Tom asked me.(改为复合句,句意不变)

Tom asked me                                                address.

5. Does this teacher often make the students copy the new words fifty times? (改为被动语态)

              the students often                       copy the new words fifty times?

6. We can’t solve this problem even though we try our best. (改写句子,句意不变)

We won’t                to solve this problem                            hard we try.