许多只粉笔 many____ of chalk 大意 main____

许多只粉笔 many____ of chalk 大意 main____ 两只粉笔chalk要加s吗? 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 o 一盒粉笔是a box of chalk 还是 a box of chalks ? a piece of chalk chalk不可数,但彩色粉笔可数,那么“一根白色粉笔”可以说成a white chalk chalk pastels是什么? 跟粉笔是一个东西吗? How many____(loaf)of bread do they need? how many____(kind)of cakes do you have? 英文歌chalk chalk chalk We need three boxes of chalk 对three boxes of chalk 提问 粉笔 英语是chalk,不可数还是可数还是单复同形呀