Section Ⅲ Grammar 复习动词时态(1)语 境 自 主 领 悟先观察原句后自主感悟1.Many factors have influenced American pronunciation since the first settlers arrived four hundred years ago.2.A Londoner has more difficulty understanding a Scotsman from Glasgow than understanding a New Yorker.3.Some experts believe that the two varieties are moving closer together.4.Users of English will all be able to understand each other — wherever they are.1.句 1 用了现在完成时态，谓语动词的构成为：have/has ＋ done 。2.句 2 用了一般现在时态，当主语为第三人称单数时，谓语动词用第三人称单数形式。3.句 3 用了现在进行时态，谓语动词的构成为：be(am/is/are) ＋ doing 。4.句 4 用了一般将来时态，谓语动词的构成为：will/shall ＋ do 。一、一般现在时1．表示经常性或习惯性的动作或存在的状态，常与 always，every time，now and then，occasionally，often，seldom，sometimes，usually 等连用。He often goes to work by bus，and he takes a walk with his wife after dinner.他经常乘公共汽车上班，而且每天晚饭后和妻子一起散步。2．表示客观事实或普遍真理。As is known to all，the earth turns around the sun.众所周知，地球绕着太阳转。3．在时间、条件或让步状语从句中，常用一般现在时表示将来。If it snows tomorrow，we will have a snowball fight.如果明天下雪，我们就可以打雪仗了。4．常用来表示按时间表、时刻表、日程表等安排将要发生的动作，只限于表示起止的动词如 go，come，arrive，leave，start，fly，return 等。The plane takes off at eight and arrives in Beijing at eleven.飞机晚上八点起飞，十一点到北京。[即时训练 1] 完成句子①As everyone knows，smoking does great harm to people's health(对人们的健康造成巨大的危害)．②If he promises to help us(答应帮助我们)，we'll win the game.③Hurry up! Flight 4026 takes off(起飞) at 18：20.二、现在进行时1．表示说话时正在进行或现阶段正在进行的动作。All the classmates are reviewing their lessons in the classroom now.现在所有的同学都在教室复...
