#2 Present simple (I do)

S + V = present simple

例えばAlex = a bus driverであるとき、Alexが寝ているときでも"He drives a bus.”と言うことができる。Alexがバスを運転している最中であるときは、"He is driving a bus"と言う。

I work / He works

一般的であったり、習慣や繰り返し起こること、普遍的な物事に対して使う。また、主語が三人称単数である場合はV-s/esの形に変化する。
●Teachers teach students at schools.
●I usually go to the gym at weekends.
●The moon goes round the earth.
●The grocery store opens at 11 am.

do / does (-? / -not)

疑問文や否定文を作るときにdo/doesを使う。
【疑問文】do/does + S + V?
【否定文】S + don't/doesn't + V.
●Do cats eat vegetables?
●Does your rabbit eat **carrots?
●I **don't eat breakfast very often.
●One of my brothers doesn't smoke at all.

以下のような場合には、doがメインのVとなる。
●"What do you do?" "I work in a hospital."
●What does your child do after school everyday? 
●My children don't do their homework by themselves.
●My father doesn't do anything to help my mother.

Saying how often we do things

ある物事を行う頻度を表すときにも使う。
●I do radio-exercise at 6:30 am every morning.
●How often do you eat dinner out?
●My ant doesn't drink very often.
●My father goes to the gym** two or three times a week**.

I promise.. / I apologize.. / I suggest.. / I advise.. / I insist.. / I agree.. / I refuse.. etc.

上記のようなVは基本的にsimpleの形で表現する。
例えば歯医者に行くことを提案をするときは、"I suggest that you go to the dentist."と言い、"I'm suggesting"とは言わない。
●I promise I'll keep the secret.
●I apologize I was late.
●I advise that you should tell her your feeling.