the article, a and the should both be accepted. It makes for very frustrating learning
Wouldn't the -m- following the tense marker mean this should be translated "I will open a window for YOU" rather than him?
No, that would be -ku- for singular and -wa- for plural.
Duo should accept the agender pronoun "them" in the english translation.
in an earlier one, I used "I will" for "nita" and was marked wrong because the program wanted "I'm going to"... this time- the opposite. It should just accept both.
I'm afraid I have to abandon this lesson; I can't determine a clear pattern to follow.
In those cases, you can switch from writing answers to selecting words from the word box. There's a button at the bottom of the page.