1.  At 4 am Sandra (wake) her boyfriend and (say) that someone (try) to get into the apartment.

At 4 am Sandra WOKE her boyfriend and SAID that someone WAS TRYING to get into the apartment.

2.  Helen (find) a gold ring as she (dig) in the garden. It looked very old and she wondered who it (belong) to.

Helen FOUND a gold ring as she WAS DIGGING in the garden. It looked very old and she wondered who it BELONGED to.

3.  The prisoner (escape) by climbing the wall of the garden where he (work). He (wear) a yellow T-shirt.

The prisoner ESCAPED by climbing the wall of the garden where he WAS WORKING. He WAS WEARING a yellow T-shirt.

4.  The accountant just (write) a cheque when he (remember) that he (have) no money in the bank.

The accountant WAS just WRITING a cheque when he REMEMBERED that he HAD no money in the bank.

5.  As we (drive) here a policeman (stop) us. He (say) that he (look) for some stolen property.

As we WERE DRIVING here a policeman STOPPED us. He SAID that he WAS LOOKING for some stolen property.