was
[wɑ:z]
v.
用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ）;
在，存在;
不受干扰;
例句:
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I think it is not about who was selected.
来自BBC
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It was just then that I chanced to look round.
就在那时，我恰好环顾了下四周。
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Abdul Kadar was content to play a waiting game.
来自L. Uris
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The military regime in power was unpopular and repressive.
当权的军政府压制人民，不得人心。
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He was well acquainted with the literature of France, Germany and Holland.
他对于法国、德国和荷兰的文学了如指掌。
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Even in old age, Walter was pretty scary.
来自BBC