they (be) two pictures on the wallthey (be) two pictures on the wall.his classmate (work) very hard on english.

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they (be) two pictures on the wallthey (be) two pictures on the wall.his classmate (work) very hard on english.
they (be) two pictures on the wall
they (be) two pictures on the wall.
his classmate (work) very hard on english.

they (be) two pictures on the wallthey (be) two pictures on the wall.his classmate (work) very hard on english.
这两道题考查的是谓语动词和助动词(be动词)在主语后的单复数匹配问题~
第一句中主语they为复数形式的指示代词,因而be动词也应该填相应的are~
第二句中主语classmate为单数形式,所以后面紧跟的动词要用单数形式,即加上s,所以应该填 works~
另外,这两句在没有上下文的基础上都视作一般现在时的时态,但如果句子整体语境和时态发生改变对应的动词也需要作相应的时态调整(如过去时、过去进行时等)~

are

works

are works

 他们(是)在wall收起两张图片
  他们(被)两个图片在墙壁上。他的同学(工作)很努力在英语。

there are
works

are