"Last summer"

it is frustrating that often adding the word "the" is counted as incorrect yet her there is no the, just last summer and if "the" is not included it is incorrect. There does not appear to be a pattern.

The other dilemma here is that, while the definite article is needed in a full sentence or in a response to a question, this is a sentence fragment (no full stop), so it's a guessing game as to how much of the fragment Duolingo wants.

The el rule in this case is?

el verano último ------ is accepted

thanks k3nd0

Both translation are good

Surely the spelling mistake pesado, should just be counted as a spelling mistake?

"Sé lo que hicieron el verano pasado."

Why does "el" need to be put in the sentence???

I wish it would just say choose the correct answer instead of the correct answers! I got tricked. I chose two answers because it said choose ALL the answers!