一、句型结构It+be+被强调部分+who/that+其他成分。二、结构解释1.be动词一般只有两种:is和was。如果原句中谓语动词使用的是现在或将来范畴的时态(一般现在时、现在进行时、现在完成时、现在完成进行时、一般将来时、将来进行时、将来完成时等),用“Itis...that...”。如果原句中谓语动词为过去范畴的时态(一般过去时、过去进行时、过去完 First, the sentence structure It + be + emphasized part + who / that + other components. Second, the structural interpretation 1. Be verbs generally only two: is and was. If the predicate verb used in the original sentence is the tense in the present or future category (general present, present now, now complete, now complete, in general, in the future, in the future, in the future, etc.) “Itis ... that ...”. If the predicate verb in the original sentence is the tense of the past category (generally past tense, past tense, past tense