一般现在时：表示真理性,经常性,习惯性,普遍性.[在口语里常用,在叙事性文章和故事里很少用] 例句：1.The earth is smaller than the sun.[状态][真理性] 2.Tom gets up early every morning.[动作][经常性和习惯性] ...一般现在时I always swim in the afternoon.It is usually sunny.He always swims in the afternoon.He feels very relaxed.The earth is smaller than the sun. Tom gets up early every morning. Everybody knows him. 一般过去时Yesterday we went to the parkThe book was there ten minutes ago. I swam yesterday afternoon.I didn't do my homework.He swam yesterday afternoon.He had nothing to do at that time.I went to swimming last week.一般将来时Tom will help you tomorrow. We shall be here in time next time. Next Friday we're going on our first field trip to study about our hometown.I'm going to visit Mary nexy MondayHe is going to study abroad.