I think it might be “dejar” but i’m not too sure because there’s no context.
If it has a correct gender specific noun. If its singular or plural. Irregular verbs. The fact there is two different verbs. Past tense or current. Verb of change. Spanish prepositions. Direct and indirect pronouns. The word gustar.
1)conoces
2)se
3) sabes
4)conosco, saben
5) conosco , se
They celebrate el día de Los muertos, they eat different food and have different cultural food and I don’t know more