A：　Oh dear, my weight has gone up again.

B：　I am not supprised, you eat too much.

A：　And I suppose sitting at the desk all day in the office doesn't help.

B：　No, I wouldn't think so.

A：　I do wish I could lose weight.

B：　Well, why don't you go on the diet?

A：　I've tried diets before but they've never worked.

B：　Perhaps you should excerise more. Why don't you go to an exercise class.

A：　Yes, maybe I should.