Language
普通现在时
Susan
表示经常性、习惯性发生事情、存在状态或自然现象用__________ 时态
I am 13 years old.I study at Tanshan Middle School.I usually go to school by bike.
普通现在
1.表示经常性、习惯性动作。  He usually has breakfast at 7 in the   morning.  I usually go to school by bus.2.表示现在存在状态。 I am 13 years old. I study at Lingshan Middle School.3.表示自然现象、客观真理。 The earth goes around the sun.  Light travels faster than sound.