Questions & Answers about Eu vejo que tu não tinhas preenchido o outro formulário.
Why do we use the regular participle preenchido here with the auxiliary verb ter?
When forming compound tenses with the auxiliary verb ter (like tinhas here), you must always use the regular past participle ending in -ado or -ido. While many verbs have a second, irregular short participle, those short forms are reserved for verbs like ser and estar. However, note that preencher is completely regular and only has the form preenchido anyway.
What tense is tinhas preenchido?
It is the compound past perfect. It translates exactly to 'had filled out' in English and is used to describe an action that happened (or in this case, did not happen) before another point in the past. You form it by combining the imperfect tense of ter (here, tinhas) with the past participle of the main verb (preenchido).
Could I drop the pronoun tu from this sentence?
Why does the sentence mix the present tense vejo with the past perfect tinhas preenchido?