The negative short form of the verb to be

Reminder: the verb to be is irregular. To be, present simple tense

In negative phrases, to be can also be conjugated in its short form, which is frequently used in informal situations:

NEGATIVE FULL FORMNEGATIVE SHORT FORM
I am notI'm not
You are not You're not/ You aren't
She/He/It is not She/He/It's not / She/He/It isn't
We are notWe're not / We aren't
You are notYou're not / You aren't
They are notThey're not / They aren't

You're not French / You aren't French.

Magda's not a doctor / Magda isn't a doctor.

With the exception of the subject I, all subjects have two negative short forms, which can generally be used interchangeably. 

You're not a teacher / You aren't a teacher.

She's not my cousin / She isn't my cousin.


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