is不及物动词 vi. 1.(用于第三人称单数现在时)是[L]The picture on the wall is beautiful. 墙上的画很美。 Mr. Smith is a very good English teacher. 史密斯先生是个很好的英语教师。 助词 v.aux. 1.(与v-ing连用构成现在进行时;与v-ed连用构成被动语态)Mr. Ward is known as a great painter. 沃德先生是一位遐迩闻名的大画家。 What is she doing over there? 她在那儿做什么?
