Cách sử dụng
When we say "fall behind," it means not being able to keep up with something or someone. For example, if you are running a race and you start to feel tired, you might fall behind the other runners. Or if you are studying for a test but you don't understand some of the material, you might fall behind your classmates. It's important to try your best to not fall behind so that you can keep up with everyone and reach your goals.