My friend Roman is a school teacher and he always says that the week before term starts is the most productive time to be at school. He can prepare his lessons and enjoy the calm before the storm!

例句 Let’s learn the basic grammar before talking about the more advanced tenses. Let’s walk before we can run! 在讨论更高级的时态之前，先来学习基本的语法。 我们要循序渐进！ We need to make sure the foundations of this project are ...