where is Sally? Tim is looking at an aeroplane. Here is another photograph.句子中的be(is)在句子中的作用是什么?

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where is Sally? Tim is looking at an aeroplane. Here is another photograph.句子中的be(is)在句子中的作用是什么?
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where is Sally? Tim is looking at an aeroplane. Here is another photograph.句子中的be(is)在句子中的作用是什么?
where is Sally? Tim is looking at an aeroplane. Here is another photograph.
句子中的be(is)在句子中的作用是什么?

where is Sally? Tim is looking at an aeroplane. Here is another photograph.句子中的be(is)在句子中的作用是什么?
谓语啊..

be 动词,也称谓语动词
希望对你有帮助哦~

1 系动词
2 助动词
3 系动词