The Singular form is la mochilla.
Nosotros podríamos ir a ver una Película.
Nosotros podemos ir a un parque de diversiones.
Nosotros tal vez podamos salir a comer. Nosotros podíamos patinar en hielo.
They end that way because they are in "infinitivo", infinitive. It is the equivalent of saying "to x"
Eg.
Aprender - to learn
Vivir - to live
Encontrar - to find
The conjugation (-er, -ir or -ar) depends on each word, it is a matter of memorising them, I'm afraid.
Hope this helped :)
Answer:what are you asking?
Explanation: what questionss
Answer: A: garajes
Explanation: La casa tiene tres garajes.
