I clean the board.怎么改祈使句?

I clean the board.怎么改祈使句? the stupid testclean the board怎么过 clean the board中文是什么 Let`s clean the board clean the board的中文意思只要这句, the board of怎么用 I got on board the plane 翻译 I clern the board.(改为祈使句) do i have to clean the room怎么回答 I clean the classroom today 怎么改为被动语态 clean i sometimes blackboard the怎么连成句子 Clean On Board B/L 请问Chairman of the board怎么翻译? i must____(clean) the classroom. telex release the clean-on-board bill of lading mardedfreight collect的翻译 i wonder if i can board the plane with his return ticket 什么结构 怎么翻译呀 I can write on the board with my hands .write on the board（划线提问） 动词过去式后的动词怎么弄?如：I helped him clean the room,为什么clean不用变?