1、表示经常发生的动作、存在的状态和现阶段的习惯
常用的时间状语有：often, sometimes, usually, always, seldom, in the morning, every day, on Sunday 等。如：
He is always ready to help others.
The students have sports at five every afternoon.
Does he work hard?
2、表示不受时间限制的事实或普遍真理
Three plus two is five.
A plane is faster than a car.
China is in Asia.
