We often use short forms of the auxiliaries. The Present Progressive is formed with the auxiliary to be (am, are, is), so short forms are very frequent.
| affirmative | |
|---|---|
| long form | short form |
| I am reading | I'm reading |
| he, she, it: | he, she, it: |
| he is reading | he's reading |
| we, you, they: | we, you, they: |
| we are reading | we're reading |
| negative (not after to be) | |
|---|---|
| long form | short form |
| I am not reading | I'm not reading |
| he, she, it: | he, she, it: |
| he is not reading | he isn't reading or he's not reading |
| we, you, they: | we, you, they: |
| we are not reading | we aren't reading or we're not reading |
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