Pensé que él fue contigo.
"Pensé que íbamos a estar en tu casa."
pensé que usted me amó
you say "tartamudear" I thought it was "tartamudez"
Pensé que tenías clases de español.
Pense que era otra persona.
pensaba que no sabrias (with an accent over the 'I' in sabrias)
Pensé que tu novia es china.
Asi que si yo le escribo esta carta.
the spanish thought of the aztecs as slaves
Translation: He estado pensando escribirte. However, that sounds a little odd in Spanish. You may wish to say "I have thought of writing you" which is "He pensado escribirte".
Gods.
They thought that the Spanish were gods incarnate.
It is.