To form familiar commands, regular -ar verbs end in -a, and -er and -ir verbs end in -e for the tú form.  Change the final -r to -d for the vosotros form.  Negative familiar commands use the subjunctive forms, so -ar verbs end in -es and -éis, while -er and -ir verbs end in -as and -áis for the tú and vosotros forms.

To make sentences negative, you place no before the verb.  Other negatives may precede or follow the verb, but if they follow, they must follow a negative verb (a double negative).  The word order is no + verb + negative.

Nunca means ever when it follows a comparative; jamás means ever when it follows an affirmative verb.

by Francisco González Bocanegra

Mexicanos, al grito de guerra El acero aprestad y el bridón; y retiemble en sus centros la tierra Al sonoro rugir del cañón. Ciña ¡oh patria! tus sienes de oliva De la Paz el arcángel divino, Que en el cielo tu eterno destino Por el dedo de Dios se escribió. Mas si osare un extraño enemigo Profanar con su planta tu suelo, Piensa ¡oh patria querida! que el cielo Un soldado en cada hijo te dio. ¡Guerra, guerra sin tregua al que intente De la patria manchar los blasones! ¡Guerra, guerra! Los patrios pendones En las olas de sangre empapad. ¡Guerra, guerra! En el monte, en el valle Los cañones horrísonos truenen Y los ecos sonoros resuenen Con las voces de ¡Unión! ¡Libertad! Antes, patria, que inermes tus hijos Bajo el yugo su cuello dobleguen, Tus campiñas con sangre se rieguen, Sobre sangre se estampe su pie. Y tus templos, palacios y torres Se derrumben con hórrido estruendo, Y sus ruinas existan diciendo: De mil héroes la patria aquí fue. ¡Patria! ¡patria! Tus hijos te juran Exhalar en tus aras su aliento, Si el clarín con su bélico acento Los convoca a lidiar con valor. ¡Para ti las guirnaldas de oliva! ¡Un recuerdo para ellos de gloria! ¡Un laurel para ti de victoria! ¡Un sepulcro para ellos de honor! Mexicanos, al grito de guerra El acero aprestad y el bridón, y retiemble en sus centros la tierra Al sonoro rugir del cañón.

Mexicans, at the cry of battle lend your swords and bridle; and let the earth tremble at its center upon the roar of the cannon. Your forehead shall be girded, oh fatherland, with olive garlands by the divine archangel of peace, For in heaven your eternal destiny has been written by the hand of God. But should a foreign enemy Profane your land with his sole, Think, beloved fatherland, that heaven gave you a soldier in each son. War, war without truce against who would attempt to blemish the honor of the fatherland! War, war! The patriotic banners saturate in waves of blood. War, war! On the mount, in the vale The terrifying cannon thunder and the echoes nobly resound to the cries of union! liberty! Fatherland, before your children become unarmed Beneath the yoke their necks in sway, May your countryside be watered with blood, On blood their feet trample. And may your temples, palaces and towers crumble in horrid crash, and their ruins exist saying: The fatherland was made of one thousand heroes here. Fatherland, fatherland, your children swear to exhale their breath in your cause, If the bugle in its belligerent tone should call upon them to struggle with bravery. For you the olive garlands! For them a memory of glory! For you a laurel of victory! For them a tomb of honor! Mexicans, at the cry of battle lend your swords and bridle; and let the earth tremble at its center upon the roar of the cannon.

If you're wondering why I didn't include the Spanish national anthem, it's because the anthem has no words; it's all instrumental.