天色很暗——看起来要下雨了。

天色很暗——看起来要下雨了。

The sky was so dark — it looked like it was going to rain.

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The sky was so dark — it looked like it was going to rain.

用 was going to 表达从过去视角根据当时迹象所做的预测(it 用 was)。going to 后接动词原形 rain。

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