1.

A:

Veronique never responded to my invitation.

B:

She may not have  received it. You should have  called her.

2.

A:

Julio hasn't answered his phone for a week.

B:

He might have gone on vacation. He should have told you. Sometimes Julio is very inconsiderate.

3.

A:

I can never fax Rocio. There was something wrong with her machine again this morning.

B:

Yeah, I have the same problem faxing her. Her machine must have run out of paper. She should have check the fax machine.

4.

A:

Andrew is strange. Sometimes he works really hard, but sometimes he seems pretty lazy. Last week, he hardly did any work.

B:

Well, you know, he might not have felt well. Still, he could have told you that he was sick.

5.

A:

I ordered a book a month ago, but the store still hasn't called me back to say the book has arrived.

B:

They may have  had a problem with the publisher, but they should have  let you know.