do I observe? do you observe? does he observe? do we observe? do you observe? do they observe?
Presente continuo
am I observing? are you observing? is he observing? are we observing? are you observing? are they observing?
Pretérito
did I observe? did you observe? did he observe? did we observe? did you observe? did they observe?
Pretérito continuo
was I observing? were you observing? was he observing? were we observing? were you observing? were they observing?
Presente perfecto
have I observed? have you observed? has he observed? have we observed? have you observed? have they observed?
Presente perfecto continuo
have I been observing? have you been observing? has he been observing? have we been observing? have you been observing? have they been observing?
Pluscuamperfecto
had I observed? had you observed? had he observed? had we observed? had you observed? had they observed?
Pluscuamperfecto continuo
had I been observing? had you been observing? had he been observing? had we been observing? had you been observing? had they been observing?
Futuro simple
will I observe? will you observe? will he observe? will we observe? will you observe? will they observe?
Futuro continuo
will I be observing? will you be observing? will he be observing? will we be observing? will you be observing? will they be observing?
Futuro perfecto
will I have observed? will you have observed? will he have observed? will we have observed? will you have observed? will they have observed?
Futuro perfecto contínuo
will I have been observing? will you have been observing? will he have been observing? will we have been observing? will you have been observing? will they have been observing?
Condicional
Presente
would I observe? would you observe? would he observe? would we observe? would you observe? would they observe?
Presente continuo
would I be observing? would you be observing? would he be observing? would we be observing? would you be observing? would they be observing?
Passado
would I have observed? would you have observed? would he have observed? would we have observed? would you have observed? would they have observed?
Passado continuo
would I have been observing? would you have been observing? would he have been observing? would we have been observing? would you have been observing? would they have been observing?