write on 写在...上的意思,写
例：Write on the form that you stayed so many nights at so much per night.
把你住了几个晚上、 每晚多少钱,填在这个表上.
write down 写下来
例：Write down the address before you forget it.
把地址写下来,省得忘了.
write with 用...写
例：Fewer people write with their left hand than with their right.
用左手写字的人比用右手的少.