When you have a bath, what's the first part of your body that you wash?
Which part of your body do you wash first when you get in the bath?
ーWhen you have a bath, what's the first part of your body that you wash?
「お風呂に入る時、あなたが最初に洗う体の部分はどこ？」
to have a bath で「お風呂に入る」
ーWhich part of your body do you wash first when you get in the bath?
「お風呂に入る時、体のどの部分を最初に洗う？」
to get in the bath で「お風呂に入る」
ご参考まで！
カナダ 
