—Who______ it be that is knocking at the door?   —It ______ be Father, but I’m not sure. 

.We were all waiting for you .You _____for the seaside by yourself without leaving a message.

 When we worked in the same office, we _____ often have coffee together.

______ for the fact that his father is general manager of the company, he would never get the job.

If I hadn’t stood under the ladder to catch you when you fell, you ____ now.