We're going for lunch.- Would you like to join us?
I need to finish this book report first.- Why don't you carry on?
- I'll join you a bit later.
- How much time do you need?
- Umm… not more than 20 minutes.
- We can wait for you.
- I'm not carrying my lunch today.
- So I'll have to get something from the canteen.
- Oh don't worry, I have extra rotis.
- It should be enough for us.
- Are you sure?
- Yeah. We will be in the library.
- When you're done, come to the library.
- OK.
Why don't you carry on?
："Why don't you carry on?"はこの場合、「（昼食に行くという行為を）あなたはそのまま続けてみてはどうか」となるので、「先に（昼食に）行っていいよ」という意味になる。
rotis
："roti"は丸い形状をした平たいパンの一種で、チャパティとも呼ばれている。主要な料理の一つで、たいてい豆類や野菜と一緒に食べられる。