You are learning conditionals: you will read the scene it happens in, learn 10 words and phrases, take apart the pattern behind them (conditional sentences), hear them in a conversation, rehearse them, and finish by saying one thing out loud to be graded.
Making contingent plans in Shanghai — if the weather is good, if there's time, if the restaurant isn't full. The grammar of possibility applied to the city's unpredictable delights.
It is day four. The stranger wakes to grey sky and the sound of rain against the hotel window. He checks his phone — Mei has already messaged: 「今天下雨了。要是你不想出去的话，我们可以改计划。」
He replies: 「如果雨不大，我还是想去田子坊。」 If the rain isn't heavy, he still wants to visit Tianzifang. Mei sends a voice message: 「好！万一雨太大，我们就去附近的面馆，我知道一家很好的葱油拌面。」
By noon the rain softens to a mist. They walk into Tianzifang's narrow alleys — the stone wet, the lanterns glowing, the smell of scallion oil drifting from a window. 「如果每次下雨都能吃到这么好的面，我希望天天下雨。」 If it could rain like this every day, he would wish for rain forever.