問題 1
OX
They play baseball after school.(彼らは放課後野球をします。)

一般動詞の否定文は,一般動詞の前に do not をつけるだけだね
一般動詞の疑問文は,文の一番前に Do をつけるだけだね
答える時も do を使うね Yes, they are. ではなく Yes, they do. No, they are not. ではなく No, they do not.(短縮形なら don't)だね
Do
do not
don't
They play
Do you like music?—Yes, I do.
Do you like music? Yes, I do.
Do you like music?—Yes, I do. だね
I do not listen to music.
I don't listen to music.
I do not listen to music. だね
You run every day.
You run every day. だね
Do you open the window every morning? だね