a piece of chalk改成a chalk不行吗?为什么要加piece of啊?chalk好像是可数名词啊,粉笔不是论根的吗?

a piece of chalk改成a chalk不行吗?为什么要加piece of啊?chalk好像是可数名词啊,粉笔不是论根的吗? with a chalk和 with chalk哪个是正确的?为什么?chalk 可数不可数可不可以用 a piece of chalk Hanz gives me a piece of chalk.(Question with What) You have got a piece of chalk.改为复数句 关于chalk一支粉笔是a piece of chalk那么一盒粉笔是a box of chalk 还是 a box of chalks Our teacher has a piece of chalk in her hand.同义句a piece of chalk in her hand.—— ——要准确地，This is a piece of chalk in her hand. Draw a _____(straightly) line here with this piece of chalk. 翻译he is writing on the blackboard with a piece of chalk her students must think she was born with an eraser and a piece of chalk in?(意译） My teacher gives me a piece of chalk.(改写同义词）My teacher_____ ____ _____ _____ _____ _____ me a piece of summer.a piece of a piece of work a blank piece of take a piece of A piece of a piece of a piece of cake a piece of paper