Corrected sentence: Elephants use their trunks to smell, to hold things, and even as snorkels when they swim.
Or a simpler version: Elephants use their trunks to smell, pick up things, and breathe when they swim.
Why this is correct (easy steps):
- We say 'elephants' (more than one), so we use 'their' and 'trunks' — not 'trunk'.
- Use verbs like "to smell" and "to hold" to show what the trunks do.
- When talking about more than one elephant, say 'snorkels' (plural) or say "breathe when they swim" to explain how they use trunks in water.
Great job asking about grammar — you're doing wonderful!