How would you command someone not to breathe using the tú command of respiar?

Which one of the following is a trick used in spanish to identify the right hand? touch the tips of your index fingers with the tips of your thumbs. the hand that forms a lowercase b is your mano derecha. touch the tips of your index fingers with the tips of your thumbs. the hand that forms a lowercase d is your mano izquierda. touch the tips of your index fingers with the tips of your thumbs. the hand that forms a lowercase d is your mano derecha.

Which form is the correct form? the clock is on the wall. el reloj estás en la pared. el reloj estuvo en la pared. el reloj es en la pared. el reloj está en la pared.

Ser/ir: past tense in this group. both verbs have the conjugation.