"Yes, I am busy on weekdays."
On desktop with IME input this isn't accepted. Forces you to use hiragana for 平日 and 忙しい.
no, i believe this is incorrect because に is only used for /specified/ places and times. so you would use に if you said you had to be somewhere at exactly nine o'clock or if you said that you were at a specified location like ”i am at the convenience store.”-> "コンビニにいます”
why is there a は in front of 平日？I thought that I was the topic of the sentence?
は is first part of yes (as in はい) then its used as in wa topic marking particle (as for weekdays) - busy it is or i am. That is my understanding So you are correct about it being the topic but not exclusive or first use in this case.
It said that I used the wrong word, because I used the kanji for へいじつ, despite it accepting the kanji on a previous question. (reported)
I'm finding this module particularly bad for swapping kanji amd kana in and out with completely different pronounciations, and no explanations, to the point where I have literally no idea what is right or wrong any more