cierras

In a sentence

• Cuando cierras la puerta, pon el seguro.

  When you close the door, lock it.

  In this sentence, 'cierras' is the second person singular (tú) form of the verb 'cerrar' (to close) in the present indicative tense. It refers to the action of closing a specific object, the door, performed by the person being addressed.

• Si cierras los ojos, podrás imaginar mejor.

  If you close your eyes, you can imagine better.

  Here, 'cierras' is used in a conditional sentence. It signifies an action performed by the person being addressed that will trigger a favorable outcome as stated in the main clause.

• ¿Por qué cierras el libro sin terminar de leer?

  Why do you close the book before finishing reading?

  In this example, 'cierras' is used to inquire about an action performed by the person being addressed—closing the book—done without completing another activity, highlighting an incomplete action.