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强调句式 It is 还是It was?

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强调句式 It is 还是It was?
什么时候用is什么时候用was呢?
我看到这样的例子:
It was my uncle that(who) sent me to the school.
It is the article that we discussed last week.
It is in the room that I was born 30 years ago.
我暂时无法总结出什么状况下用is什么情况下用was.
强调句式 It is 还是It was?
一般说来,强调结构it be…that…中的be的时态应与句子时态一致,即同时用现在时,或同时用过去时,有时也可能用将来时.如:It is not I who am angry.发怒的不是我.(同时用现在时)
It was my two sisters who knew her best.是我的两个姐妹最了解她.(同时用过去时)
It will not be you who will have to take the blame for this.对此须受责难的将不是你.(同时用将来时)
但有时也可以不一致,这主要见于强调结构用it is…that…(即用的是现在时),而句子用的是过去时.如:It is Miss Williams who enjoyed reading novels as a pastime.是威廉姆斯小姐以读小说来消遣.