Je was op zoek naar: the stegosaurus is writing a paper (Engels - Latijn)

he is writing a book.
librum scribit.

is jimmy writing a letter?
scribitne iacobus epistulam?

his mother is writing a letter.
mater eius epistulam scribit.

the teacher is writing in his office.
doctor in officio suo scribit.

he is writing a letter to his friend
bestias in silva mihi auditi

he is writing a letter to his parents now.
nunc parentibus epistulam scribit.

are they writing a letter?
scribuntne epistulam?

i am not writing a letter.
epistulam non scribo.

when you worry about writing a book
cum cura librum scribebat

he or she is writing, does write, writes
scribit

when writing a sentence, generally you start with a capital letter and finish with a period (.), an exclamation mark (!), or a question mark (?).
cum sententiam scribis, littera maiuscula eam fere incipis et puncto (.) an signo exclamationis (!) an signo interrogationis (?) eam finis.