星期天如果阴天或下雨，白天外出的选择就不多了。

On Sunday, if the weather is cloudy, rainy or cold, the possibilities for getting out are limited during the day.

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我妈妈每个星期天都去购物，除了当下雨的时候。

My mother goes shopping every Sunday except when it rains.

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上星期天我们本想去游览长城的，但却下雨了。(没有去成)。

Last Sunday we were going to visit the GreatWall, but it rained.

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