[graciegirl]

I think maybe reading a book on etiquette may be more helpful.

No one likes to lie but most of us do commit a few social fibs, side steps and excuses.

Here are some suggestions;

I would love to but I have an appointment.

I was just leaving, I am sorry we can't visit right now.

I can't invite you in, my girlfriend hasn't left and she is shy and she can't find her shoes. We just got her underwear off the chandelier.

I was just going to the market.

I have other plans.

The toilet is clogged and we have a mess, perhaps another time?

I am so sorry but the (choose the opposite political party from his) group are meeting here in a few minutes and I have to run and get candles.

HOWEVER, if your friend is like mine, waiting for them to draw breath so you can actually SAY any of these things may be difficult.