was 是 be 的过去式。be 有三种用法， 用在过去时态表示单数时用 was。三种用法如下：
〔系动词〕
～表示 “是”，如 He was a teacher some years ago. (几年前他从句是个教师)
～表示 “在”，如 He was at home just now. (他刚才在家)
〔助动词〕
～与现在分词一起构成过去进行时，如 I was waiting for him for long. (我曾长时间等着他)
～与过去分词以一起构成被动语态，如 The room was cleaned a moment a go. (房间刚才曾被清扫过)
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