一般现在时的标志词是什么？
一般现在时精讲
一、一般现在时（present simple）的定义：描述现阶段经常反复发生的动作或者存在的状态。
例如：I have two English classes on Tuesday morning. 我在星期二的早晨有两节英语课。这句话的意思是，一旦到了周二早上，我都有两节英语课，周周如此，循环往复，反复发生。
二、一般现在时的标志词
频率副词：always总是，usually 通常，often 经常，sometimes 有时，seldom 很少，never 从不。表示频率的词：every day每天，once a week 每周一次，on weekends 在周末。
例句：
The policeman goes to work by car every day.那位警察每天开车上班。
I often wash my clothes on weekends.我经常在周末洗衣服。
The doctor never smokes，but he sends the cigarettes to his father.这个医生从不抽烟，但是他送烟给他的父亲。
三、动词第三人称单数形式V-s的变化规律
1.动词第三人称单数：当句子的主语是第三人称单数时，谓语动词要变为V-s的形式。
2.V-s动词第三人称单数的变化规律：
（1）一般情况下，直接在单词尾加-s，例如：live—lives居住，run—runs跑，give-gives给，eat—eats吃。
（2）以字母ch（吃），x（稀），sh（屎），s（死），o（噢）结尾的，在词尾加-es，例如：watch—watches 观看，fix—fixes 修理，push—pushes 推，pass—passes传、递，do—does做，干。
（3）以“辅音字母+y”结尾的动词，变y为i，再加-es，例如：study—studies学习，try—tries尝试，fly—flies 飞。
（4）不规则变化：have—has。
四、一般现在时的用法
1.表示现在的情况或状态
She knows several languages.她懂几种语言。
The soup tastes good. 这汤味道很好。
2.表示现在习惯性、经常性的动作或状态
Where do you live and where do you work? 你住在什么地方? 在哪里工作?
When do you usually have breakfast? 你通常什么时候吃早饭?
3.表述普遍真理、客观存在及自然现象
China lies in the east of Asia.中国位于亚洲东部。
In summer, days are longer than nights and in winter it's the opposite.夏天白天比夜晚长,冬天相反。
4.表示按时间表或计划将要发生的动作
The final exam takes place next week. 期末考试下周进行。
The train leaves London at six and arrives at Birmingham at eight. 火车六点离开伦敦，八点到达伯明翰。
5.用于时间、条件等状语从句中表示将要发生的动作
We'll let you know as soon as you arrive.你一到,我们就告诉你。
If it doesn't rain , we'll go on a picnic as planned.如果不下雨,我们将按计划去野餐。
五、一般现在时的构成（见图）
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