La orquesta tiene un concierto mañana. Hoy tienen que

Okay so i'm taking an online spanish course (penn foster), and in the study guide, you have to create a bunch of sentences with words you've learned so far. translating, reading, and those kinds of things are fairly easy, but when it comes to making my own sentences, my brain just kinda waltz's away. anyone got any tips?

Esta piña es mi piña. correct incorrect

Iate fruit. yo comistes fruta. yo comí fruta. yo comimos fruta. yo comieron fruta.