一时态
语法精讲1．一般现在时：①经常性、习惯性的动作②现在的特征状态③普遍真理，客观存在，谚语格言，新闻标题，介绍说明，人物、作品评价等．④现在瞬间（多用于体育报道）
1) He is always ready to help others.
2) It never snows in Guangzhou.
3）The teacher said that light travels faster than sound.
4) Here comes the bus.
⑤表示按规定、计划或安排要发生的情况（句中常有表未来的时间状语）即按时刻表规定或难于改变，但限于少数动词begin, come, leave , go, arrive, start, stop, return, open, close 等。
eg. The train leaves at 10 a.m. School begins next Monday.
⑥在时间或条件状语从句中，多用一般现在时表示将来时。
eg. He will come to see you before he leaves China.
注意：有时从句中有情态动词will，不是指将来，而是一种意愿或客套话。
eg. If you will wait (=please wait ) a moment, I’ll go and tell the manager that you are here.
⑦表示状态、感觉、感情、从属、心理活动的动词，如be, exist, remain, stay, obtain; hear,
