1. Decide if the tenses in these sentences are correct or not. if not, correct them

a. They are talking since 8 o'clock so it must be something important.

b. I have this computer for three years and it works very well.

c. We have seen a lot of films recently ans I think "Kill Bill" is theworst

d. We haven't talked for ages! How are you?

e. I've been patient. I was waiting for six weeks, but I can't any longer.

f. How many letters have you received so far?

g. When have you seen her?

h. I have cleaned the house since the morning and I haven't finished yet.

i. We are neighbours for a long time