一般现在时用法

一般现在时用法

一般现在时主要用来表示经常性或习惯性的动作，或者是现在的特征或所处的状态。如：He often goes to school on foot every morning.She is at work now.They are primary school students.从谓语动词的分类来看，一般现在时的基本结构主要分三种情况，即：1、主语+be+其他成分其中的be，会随着主语的不同，有am/is/are的变化。am的主语是I，is的主语是第三人称单数，are的主语是第一人称复数、第二人称的单数和复数、第三人称的复数。如：I am ten years old.He is in the classroom.They are in the zoo at the moment.2、主语+do/does+其他成分其中，动词do的主语为第一人称的单数和复数、第二人称的单数和复数、第三人称的复数，does的主语为第三人称的单数。如：We always stay up late on Saturday.You often forget to bring your textbooks with you.She likes apples very much.3、主语+情态动词+be/do+其他成分此时，情态动词采用的是现在形式，后面的动词都采用原形。如：She can be a good teacher in the future.I must leave for the party now.主要用法1、表主语现在所处的状态The book is on the desk.I am very busy.2、表主语的身份或职业She is our English teacher.His father is a doctor.3、表主语的特征或特点The dog often barks at strangers.He is bad-tempered.4、表主语的能力The cat can see well in the darkness.He is good at swimming.5、表主语的国籍Mary comes from Britain.He is a Chinese.6、表主语经常性或习惯性的行为Jack sometimes goes hiking by himself on weekends.They usually visit museums in their spare time.7、表主语的兴趣爱好She likes reading novels very much.I want a cup of tea.8、表天气或气候It is sunny today.It often rains a lot in spring in Shanghai.9、表客观事实或真理Taiwan lies in the southeast of China.The sun rises from the east and sets in the west.10、表按计划或安排好的或将要发生的动作这类用法一般只限于start、begin、leave、go、come、arrive、return、take place等。 如：The train leaves at four tomorrow afternoon.She comes back home tonight.11、表将来（在时间和条件状语从句中）If he comes, I will tell him about it.When the plane arrives, she will meet him herself.12、用在格言、警句中Pride goes before a fall. （骄必败。）Time is money. （时间就是金钱。）13、表过去1） 用于某些动词（tell、say、hear、learn等）表示不确定的过去时间。如：She tells me Jack will come tomorrow. （她告诉我杰克明天要来。）I hear that he won the first prize in the competiton last week. （我听说他在上周的比赛中得了第一名。 ）2）当要陈述一个客观事实时，有时即使有过去时间状语也可用一般现在时。如：The story is set in the summer of 1937. （故事的背景是1937年夏天。）The story begins in the year 1937. （故事开始于1937年。）