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①When he was orbiting in the capsule, he took photographs of planet earth.
②When Yang landed, Premier Wen Jiabao telephoned the Control Centre to offer his congratulations.
③While he was travelling in space, Yang spoke to two astronauts aboard the International Space Station.
④Since no one else saw the aliens, not many people believe Mr. Bates.
⑤Now that I have made this first visit, I hope I can come many more times.
⑥“As you have asked me so nicely，” said Sharon, “I'd be delighted to sign your arm.”
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1.句①②③中的黑体部分引导时间状语从句，句④⑤⑥中的团体部分引导原因状语从句。
2．while引导的时间状语从句中的谓语动词必须和主句谓语动词同时发生。
3．as表示较为明显的原因，语气较弱，比较口语化。如句⑥。
4．since引导的原因状语从句一般放于主句之前，表示已经的、显然的原因。如句④。
5．now that后接已知的情况，意为“既然”，如句⑤。
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