A formula

Remember how to form negative tú commands by means of the following formula:

1. Start with the word no,
2. then take the yo form conjugation of whichever verb you want to use,
3. drop the -o,
4. add the opposite ending plus an s.  So, in making a negative tú command with an–ar verb, you add the vowel –e, , plus an s. In making a negative tú command with an –er or –ir, you add the vowel –a, plus an s.

Imagine you really love babysitting, but you don’t want the Colombian girl you babysit for to jump on her bed or eat messy food on the elegant sofa in the living room.  In order to tell her so in Spanish, using the verbs saltar and comer, you do the following: