The correct answer is A - El libro esta debajo del escritorio. Debajo means below/under
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
