We saw some dolphins in the lake.(改为一般疑问句) _____you_____ _____dolphins in the lake?

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• We saw some dolphins in the lake.(改为一般疑问句) _____you_____ _____dolphins in the lake?
• We saw some dolphins in the lake.(改为一般疑问句) _____you_____ _____dolphins in the lake?
• there are some sheep near the lake一般疑问句
• There used to be some big trees by the lake, ___________? 怎么变反义疑问句?只有一种变法吗？ 可以用weren't there吗？