write down the number on为什么要用on?

请求语法指点 I did write down the number on the paper. write.down; write.on; write.in write down 和write on的区别 Please write down your hobbies and i_____ on the paper write down your name on the blackboard改为否定句 Write down your name on the eard翻译 Writing:write down your composition on the ANSWER SHEET (alt please write the notes down on your n_____ has she -----(write)down the telephone number write down on the blackboard“写在黑板上”,其中down可以省略吗?说成write on t write on与write down与write with区别? Write the number on the blackboard _____.翻译：把黑板上的这个数字用文字的形式表