19 is preterite. 20 is imperfect. 21 is conditional.
Yes the answer is correct
Fill in the blank with the correct direct object pronoun, based on the word in parentheses, that best complete this sentence:
Mi madre y yo _______ miramos. (fresas)
Answer: Mi madre y yo las miramos.
Explanation: (Fresas) is a feminine plural noun, so her pronoun must be feminine plural too.
Hope this helps!