没错,以下的例子解释的比较清楚: But there are words that look like verbs that are not functioning as verbs in a sentence. The way to tell if these words are "working verbs" is to look for a subject (a noun or pronoun) that tells you who or what? For example in the sentence, "The bone was eaten by the dog," you know that was eaten is a working verb because it has a subject that answers the question "what was eaten?" But in the sentence "Jack expects to spend his winter vacation in Colorado skiing the slopes," the word skiing is not a working verb because it doesn't have its own subject.
"working verb,a verb that can run a sentence by itself." manhattan这么解释,让我觉得最明白,不用找出确切那些词属于working verb,哪些不属于。放到句子里面去看。 The electron named in 1894.错误 The electron was named in 1894.正确。 因为electron只能被命名,所以named 这单个词不能在第一句里run the sentence.所以这个named不是working verb。
Working verb:A verb that could be the main verb of a grammatical sentence. A working verb shows tense, mood and voice, as well as number and person in some circumstances. The use of this term helps to distinguish working verbs from verbals(非谓语动词), which cannot by themselves be the main verb of a sentence.