Section Ⅱ Grammar——动词的常用时态课前自主预习[例句·体验]1．He does his homework before dinner every evening.他每天晚上晚饭前做作业。2．The train for Hankou leaves at 8：00 in the morning.开往汉口的列车早上 8 点发车。3．Listen! Someone is playing the piano.听！有人在弹钢琴。4．She is leaving for London tomorrow.她明天去伦敦。5．She has taught in the school for ten years.她在这所学校教书已经 10 年了。6．I haven't eaten anything since breakfast.我从早饭起就一直没有吃东西。7．They are going to move to a new house next week.下星期他们将迁入新居。8．What shall we do if he doesn't come?如果他不来，我们该怎么办？课堂合作探究[语法·讲座]一般现在时、现在进行时、现在完成时、一般将来时时态是表示谓语动作时间概念的动词形式。英语中的时态专指谓语动词，不同时间概念的谓语动作有不同的时态。英语中不同时间发生的动作，要用不同形式的动词来表示。另外，谓语动词若与主语之间是主动关系，我们就用主动语态，若为被动关系，就用被动语态。首先看本模块涉及的四种时态的形式。(以 ask 为例)1时态主动被动一般现在时ask/asksis/am/are asked现在进行时is/am/are askingis/am/are being asked现在完成时have/has askedhave/has been asked一般将来时will/be going to askwill/be going to be asked一、一般现在时1．表示现在经常发生的动作或存在的状态，常与 usually, always, seldom, sometimes, often, every day, on Sundays 等时间状语连用。①I often go to school on foot.我经常走着去上学。②They play football after school every afternoon.他们每天下午放学后踢足球。2．表示主语的特征、状态、能力、性格等。③This job calls for great patience.这份工作需要极大的耐心。④She is always ready to help us.她总是乐于帮助我们。3．表现客观事实、普遍真理或名言警句等。此用法即使出现在表示过去时间的语境中，也要用一般现在时。⑤Light travels faster than sound. 光比声音传播得快。⑥Actions speak louder than words.(谚)行动胜于空谈。⑦The sun rises in the east and sets in the west.日出东方，日落西山。4.在由 when, if, af...
