Hello~<br/><br/>I want to know if I can say in this way:<br/><br/>The teacher wrote on the blackboard with <b><font color="#ff1493">a chalk</font></b>.<br/><br/>I know it's better to say "<i><b>a piece of chalk</b></i>", but I still want to know if I can say "<i><b>a chalk</b></i>".<br/><br/>By the way, I found an expression in my dictionary which says "a box of colored <b>chalks</b>". If that is correct, then "a chalk" may seem reasonable, too.<br/><br/>Please give me your opinion and I'll appreciate it.