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观察下列句子，试着归纳其画线部分所包含的句型结构。
1．If you hear a comedian telling jokes about the way people behave when they queue up in lines, or asking why it only rains when you forget your umbrella, you are listening to an observational comedian．
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2．It seems appropriate that he got his start in silent films!
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3．I must have forgotten to tell you．
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