Questions & Answers about No dobles la rama, que puede romperse.
Because this is a negative command addressed to tú.
In Spanish, negative commands for tú use the present subjunctive, not the normal present tense:
- doblas = you bend / you are bending
- no dobles = don’t bend
So:
- Dobla la rama. = Bend the branch.
- No dobles la rama. = Don’t bend the branch.
The ending -es here is the tú form of the present subjunctive of doblar.
Compare:
So no dobles means the speaker is telling one person informally: don’t bend it.