①本句是一个主从复合句。

②As Yang ... atmosphere是________状语从句，helicopters were flying to ... him是主句。

③在主句中，从句where he would land作介词to的宾语；ready to collect him是形容词短语作状语，说明helicopters的状态。

【句意】当杨利伟返回地球大气层时，直升飞机正飞往他要着陆的地点，准备迎接他。

【仿写】当维姬（Vicky）即将到达汽车站时，我开车前往她要下车的地方，准备迎接她。

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答案

1. 【分析】started

【仿写】Yao Ming, who was a professional basketball player, comes from Shanghai and started learning basketball when he was a child.

2. 【分析】伴随状语

【仿写】When the Spring Festival comes, many people display paper lanterns in the shape of animals, expressing the wishes of Chinese people to pray for long lives and happiness.

3. 【分析】时间

【仿写】As Vicky was about to arrive at the bus station, I was driving to where she would get off, ready to collect her.