When we use Simple Present ?

​1.Descriptions of facts.说明事实的时候。

e.g. 1. Water boils at 100​°C. {水在100度沸腾。}

​ 2.Some backteria cause diseases. {部分细菌会导致疾病}

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​2.Descriptions of everyday life.说明日常的时候。

​e.g. 1.My brother drives a lorry.{哥哥驾驶卡车}

​ 2. They seldom wash their dishes. {他们很少洗自己的碗碟}

Subject in the sentences 句子里的主语

1.When the subject is singular,use singular verb

​e.g. He has/She has/It has/The boy has

​ He is/She is/It is/The boy is

​ He goes/She goes/It goes/The boy goes [单数主语动词加s]

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​2.When the subject is plural,use plural verb

​e.g. I have/You have/We have/They have

​ I am/You are/We are/They are

​ I go/You go/We go/They go [I,you 和 复数动词不加s]