一、其表现形式如下

　　一般现在时：动词用原形或第三人称单数 does

　　一般过去时：动词用过去式 do

　　一般将来时：动词用will do 或 am/is/are going to do

　　过去将来时：动词用 would do 或 was/were going to do

　　现在进行时：动词用 am/is/are doing

　　过去进行时：动词用 was/were doing

　　现在完成时：动词用 have/has done

　　过去完成时：动词用 had done

　　二、常考易错点

　　1) 表时刻表的情况下，一般现在时代替将来时态用;

　　The plane takes off at 10p.m.

　　2) 主将从现 符合的原则是：if条件句，时间状语从句，方式状语从句和让步状语从句。如：

　　If he comes, I'll let you know.

　　He will be happy when I tell him.

　　Next time I'll do as you say.

　　Even if it rains tomorrow, the sports meet will take place.

　　3) be to do 表示有责任、有义务做某事

　　be about to do 表示正要做某事

　　I was about to leave when the telephone rang.

　　be going to do 表示有计划性、准备做某事

　　will do 一般情况下使用

　　4)现在进行时注意以下情况:

　　1) 和always, constantly, forever, continually连用表示说话人的感情色彩，责备，埋怨等;

　　He is always thinking of others.

　　He is always making the same mistake.

　　2) 强调情况的暂时性;

　　He is walking to school because his bike is being repaired.

　　5). 一般将来时注意以下三点。

　　1) 表倾向，习惯性动作。意为"会，不能，没法";

　　We will die sooner or later. The medicine won't help.

　　2) 表推测

　　The man in the middle will be visiting president.

　　3) 表容量

　　The hall will seat 500 people.

　　6). 现在完成时的适用范围。

　　1) 过去动作对现在的影响和结果;

　　I've already finished my homework, so I can leave now.

　　2) 过去开始持续到现在;

　　Great changes have taken place in China in the past five years.

　　7). 过去完成时注意两点。

　　1) 它是和一般过去时对应存在的，没有一般过去时，就不存在过去完成时。

　　His family hadn't heard from him for six months until he came home.

　　2) 用在no sooner…than, scarcely…when, hardly…when,等句型中。

　　No sooner had I seen him than I told him.