To make a negative sentence in English we normally use "do not" ("don't" in its contracted form) or "does not" ("doesn't" in its contracted form) with all verbs EXCEPT to be and modal verbs (can, might, should etc.). "Don't" is added between the subject and the verb. We use "don't" when the subject is I, you, we or they, and "doesn't" for he, she, it. Please note that the -s that marks the third person at the end of the verb for the affirmative dissapears in the negative form, as the third person is marked in the particle. Examples: Affirmative: I like cakes. Negative: I don't like cakes. Affirmative: He likes cakes. Negative: He doesn't like cakes.
- No camine en el césped. -> Do not walk on the grass.
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