1.  After several long phone consultancies, my wife had me call a friend who knows computers for some personal consultancy.

2.  He knows computers.

3.  I know computers and such-like are supposed to make our lives easier.

4.  The first step is to find a sales representative who knows computers.

5.  They are learning to be machine-tool operators, and today that means they have to know computers.

6.  They may know computers, but nothing about how editing creates drama and emotion.

7.  Yet I do know this computer intimately and I fear no malfunction.