1. Den
2. Esté
3. Almuerzo
4. No sirvan
5. Ve
Ellas son (fuertes).
Because it’s in plural.
I’m a Spanish fluent .
To memorize the irregulars, remember last words, like -é, -emos, <span>-éis, -án. Connect normal irregulars with these words. Boom, you make a future tense irregular.
Estar+emos=estaremos
Vivir+é=viviré</span>
I am almost certain it is sois.