You can write a button conditional like this...
IF BUTTON(0) AND #A THEN 'ETC
You can replace the #A with other constants.
The number in the BUTTON instruction represents what kind of button input you want to get. 0 (or none) gets input of a button getting pressed and held. 2 will get you input of buttons only on the time they get pressed (not held). Look up BUTTON's help entry for the rest.
0そうだね プレイ済み