To be: affirmative and negative short forms

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

In affirmative and negative phrases, to be can also be conjugated in its short forms:

AFFIRMATIVE

I'm
You're
He/She/It's
We're
You're
They're

NEGATIVE

I'm not
You're not / You aren't
He/She/It's not / He/She/It isn't
We're not / We aren't
You're not /You aren't
They're not / They aren't

You're French.

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

The short forms are frequently used, especially in informal situations.

You’re tall.

It’s not a good idea.

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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