He seems not to have grasped what I meant,which greatly upse

He seems not to have grasped what I meant,which greatly upsets me.他似乎没抓住我的意思,这使我心烦.Liquid water changes to vapor,which is called evaporation.液态水变为蒸汽,这就叫做蒸发.一个要加be动词一个不用为什么