We use too and either at the end of a sentence.
| We use too after a positive verb: | We use either after a negative verb: |
| • A: I‘m happy. | • A: I‘m not happy. |
| B: I’m happy too. | B: I‘m not happy either, (not ‘I‘m not… too’) |
| • A: I enjoyed the film. | • A: I can’t cook. |
| B: I enjoyed it too. | B: I can‘t either, (not ‘I can’t too’) |
| • Mary is a doctor. Her husband is a doctor too. | • Bill doesn’t watch TV. He doesn‘t read newspapers either. |