请问这3个there,their ,they are.

there[TZE, TE]adv。在那里At or in that place:在那里：sit over there。坐那边To, into, or toward that place:到那里,往那里去：wouldn't go there again。别再去那里了At that stage, moment, or point:在哪个阶段,在哪个时刻,在那点上：Stop there before you make any more mistakes。在你犯更多的错误之前就罢休巴In that matter:在那件事上：I can't agree with him there。在那件事上我不能同意他pron。（代词）Used to introduce a clause or sentence:用于引导从句或句子：There are numerous items。 There must be another exit。有许多项目。一定有另一个出口Used to indicate an unspecified person in direct address:在直接对话中指非特定的人：Hello there。喂adj。（形容词）Used as an intensive:用于强调：That person there ought to know the directions to town。那个人应该知道镇子的方向n。（名词）That place or point:那个地方或那点：stopped and went on from there。停下来并从那儿开始interj。（感叹词）Used to express feelings such as relief, satisfaction, sympathy, or anger:用于表达情感,如放松、满意、同情或生气：There, now I can have some peace!好了,现在我能安静一些了!用法：1。标准规则认为,当代词there 出现在如 be,seem 或 appear 的动词之前时, 则动词的数遵照如下语法实例：There is a great Italian deli across the street。 穿过街道,有一家大的意大利熟食店。There are fabulous wildflowers in the hills。 山中有极美的野花。There seems to be a blueberry pie cooking in the kitchen。 厨房里好象正在做越橘果排 。There seem to be a few trees between me and the green。 在我与草坪之间好象有一些树。 2。然而,当技术上要求用复数动词时,口语中常用缩写there's , 如在有两个要去的好理由 中。 当作为连接词的短语中最接近动词的主语为单数时,且短语必须与动词保持一致,也有用单数动词的趋势：To the left, there is a beautiful entry hall, a sitting room, and a sun porch。 剩下的部分,有一漂亮的走廊,一个客厅和一个阳台。3。尽管严格地讲,这种用法是错误的,但动词对于跟随它的单数名词短语的吸引力如此之强以至几乎没有作者能完全避免这种结构。指示形式that there 和 this here 是不标准的their pron。他们的, 她们的, 它们的用法：Used as a modifier before a noun:他们的：用作名词前修饰语：their accomplishments; their home town。他们的成就；他们的家乡Usage Problem His, her, or its:【用法疑难】 他的,她的,或它的：“It is fatal for anyone who writes to think of their sex”(Virginia Woolf)See Usage Note at he 1“写作时考虑性别对任何人都是致命的”(弗吉尼亚·沃尔夫)参见 he1They are 意思是“他们是。。。” 我和楼上的意思差不多