Sure, here is the completed table:

| Verb 'to BE' | Affirmative | Negative | Interrogative |
|--------------|-------------|----------|---------------|
| | Long form | Short form | Long form | Short form | Long form |
| I | I am | I'm | I am not | I'm not | Am I? |
| You | You are | You're | You are not | You aren't | Are you? |
| He | He is | He's | He is not | He isn't | Is he? |
| She | She is | She's | She is not | She isn't | Is she? |
| It | It is | It's | It is not | It isn't | Is it? |
| We | We are | We're | We are not | We aren't | Are we? |
| You | You are | You're | You are not | You aren't | Are you? |
| They | They are | They're | They are not| They aren't| Are they? |

We usually use the short forms when we speak.
e.g. I'm Rosie.