I have to take off some weight. 我得减肥了。
B:I look awful in a swimsuit.I am too fat.
A:Well,you're a little plump,but you aren't fat.
B:It's very nice of you to say that,but I know I've gained much weight.Look at you!You are much more skinny than you were.
A:To be honest,I do have lost about five kilos.
B:Wow!How do you manage to become so slim?What's the secret?
A:I go on a diet and have a constancy of exercise.
B:Is that all?Well,I have to take off some weight,too.
A:How do you plan to put it into practice?
B:I'm going to have only juice for each meal from now on.