In this context, it means that the speaker cannot understand how the company is able to retain or keep the clerical staff when it pays such a small amount of money to them. Another example of when you see "get away with" is as follows: If a child is behaving badly, one might say to the parent "Why do you let him get away with such poor behavior?"

Negative: I have not done ... or I haven't done... Question: Have I done...? Or Have you done...? Alternatively, you could also use Have I completed...? Examples: Have I done the dishes? Have I completed this assignment correctly? I haven't done that yet.

Some phrases

1.- There were a lot of people in the super market
2.- There will be a meeting tomorrow at the job work 
3.- I had good teachers in the University
4.- I've been learning english for a year
5.- will there be english classes tomorrow?
6.- Was he cooking pizza?