Okay so its basically asking you how it happened... well here it is:
Fueron al parque sin una correa para el gato, luego el gato se escapó y salió a la carretera y venía un automóvil, así que para evitar al gato, el automóvil chocó contra un árbol. El gato se asustó y subió al árbol. Ahora el gato está atrapado.
In english:
They went to the park without a leash for the cat, then the cat got away and on the road and a car was coming, so to avoid the cat the car ran into a tree. The cat got scared and went up the tree. Now the cat is stuck.
present tense conjugations vary for each ending (-ar, -er, and -ir)
they are all relatively simple. just drop the ending (one of the 3 listed above) and replace it with the conjugations listed below.
for -ar verbs: yo-o
tu-as
el/ella/usted-a
nosotros-amos
vosotros-aís
ellos/ellas/ustedes-an
for -er verbs: yo-o
tu- es
el/ella/usted-e
nosotros-emos
vosotros-eís
ellos/ellas/ustedes-en
for -ir verbs: yo-o
tu-es
el/ella/usted-e
nosotros-imos
vosotros-ís
ellos/ellas/ustedes-en
remember that these conjugations are only good for regular, present tense verbs