Grammar errors

I can't tell you the exactly number but I think it's probably fourteen.

I would want very much to move to a new house if I have that job.

My instructor has been learning me English for over 6 years now and I must admit I haven't yet mastered the basics.

I wander why it is that you always manage to say something that is guaranteed to upset the person you are talking to.

Now do you remember the word 'customer'? What does this word really mean? When in fact you know what the words mean, then how would you actually explain it?

After two weeks she saw an advertisement that appealed to her and she wrote her letter of appliance.

The boss of the factory liked her and offered her the job straightforward.

B: Well, I've been thinking about weather I've been good enough to get any presents this year.

I was just wandering what it would be like if suddenly we lost all our money and found ourselves poor.

In order to save money householders are asked to leave their dustbins at the border of their gardens.