Simple Present
A sentence is presented in simple present tense when it is used to describe an action that's happening at present and does not indicate when the action is expected to end. Simple present tense is used when:
The action that is taking place in general.
The action is not only occurring now; it repeats after regular intervals of time.
To indicate facts those are generally true.
The action for relating habits and routines that happen all the time, be it in the future, past or present.
Examples
I play tennis.
She does not play tennis.
Does he play tennis?
The train leaves every morning at 8 AM.
The train does not leave at 9 AM.
When does the train usually leave?
She always forgets her purse.
He never forgets his wallet.
Every twelve months, the Earth circles the Sun.
Does the Sun circle the Earth?
Structure
[VERB] + s/es in third person
If subject is 3rd person singular.
The verb is used in its original form;
If subject is 1st and/or 2nd person singular.
If subject is 1st and/or 2nd person plural.
If subject is 3rd person plural.
Positive,Negative,Question Forms
positive negative question
I work in a bank.
You work in a bank.
We work in a bank.
They work in a bank. I don't (do not) work.
You don't (do not) work.
We don't (do not) work.
They don't (do not) work. Do I work in a bank?
Do you work in a bank?
Do we work in a bank?
Do they work in a bank?
He works in a bank.
She works in a bank.
The bank opens at 9 o'clock. He doesn't (does not) work.
She doesn't (does not) work.
It doesn't (does not) open at 9 o'clock. Does he work?
Does she work?
Does it open at 9 o'clock?
Present Simple - Common Mistakes
Common mistakes Correct version Why?
I working in London. I work in London. The -ing form is not used in the present simple.
He work in London. He works in London. The third person he, she, it adds the letter s.
He work in London? Does he work in London? Questions - third person:
does + subject + infinitive.
All other persons:
do + subject + infinitive.
Work he in London? Does he work in London?
He not work in London.
He doesn't work in London. Negatives - third person:
subject + doesn't + infinitive.
All other persons:
subject + don't + infinitive.