That command is wrong because it is not a command, as it is more like a warning or fact. It is not being properly conjugated; to be written in a correct form it should be written as: NO CAIGAS.
<u>NO CAES</u> is written in the simple present form, the main verb <u>CAER</u> is only conjugated with the second-person singular <u>TÚ.</u>
1. Si, a la maestra si le gusta tocar la guitarra. 2.Su a nosotros si nos gusta la fruta. 3.Si, a mi si me gusta beber jugo. 4. Si, a ellas si les gusta leer libros.