Leaving out words to avoid repetition: I can swim and she can too → I can swim and she can
Keep auxiliary/to; omit main verb and following words
Same principle with negative auxiliary
Same principle
💡 Ellipsis makes speech more natural and avoids awkward repetition.
✓'Will you come?' 'I might.'
✗'Will you come?' 'I might come.'
Omit repeated verb after modal.
✓I wanted to call, but I forgot to.
✗I wanted to call, but I forgot to call.
Keep 'to', omit verb.
✓'Is it true?' 'I believe so.'
✗'Is it true?' 'I believe it is true.'
Use 'so' to replace clause.