观察下列句子，试着归纳其画线部分所包含的句型结构。

1．What problems do you think people in the future will have overcome?

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2．The air seemed thin as though its combination of gases had little oxygen left．

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3．They require the same atmosphere as humans and are great engineers．

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4．Neither of these creatures is easy to talk to．

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5．The mu-mu drink a strange mixture of carrot juice and cocoa, while the dimpods drink lemonade mixed with herbs．

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