There were some birda in the tree.(改为一般疑问句)

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There were some birda in the tree.(改为一般疑问句)

was were 属于be动词的一般过去式形式,was用于单数,were是复数.
陈述句:主语+be动词+.
变一般疑问句的话,则be动词提前:Be+主语+.用 Yes/No回答.