Question

choose the correct answer. imperfect er/ir yo í a nosotros/as í amos tú í as vosotras/as í aís él/ella/usted í a ellos/ellas/ustedes í an (construir) con bloques mucho ustedes? construirían construíamos construíais

Explanation:

The subject in the question is "ustedes" (you - plural formal). For the imperfect tense of -ER/-IR verbs, the form for "ustedes" is the stem of the verb + -ían. The verb "construir" (to build) has the stem "constru". So the correct form is "construían".

Answer:

construían