it is the first time i have ever been on a stage这个玩意到底是什么时态的?费解死我了,还有就是这个i knew immediately there'd been a mistake 这个里面的there'd展开是什么玩意?

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itisthefirsttimeihaveeverbeenonastage这个玩意到底是什么时态的?费解死我了,还有就是这个iknewimmediatelythere''dbeenamistake这个里

it is the first time i have ever been on a stage这个玩意到底是什么时态的?费解死我了,还有就是这个i knew immediately there'd been a mistake 这个里面的there'd展开是什么玩意?
it is the first time i have ever been on a stage
这个玩意到底是什么时态的?费解死我了,
还有就是这个i knew immediately there'd been a mistake 这个里面的there'd展开是什么玩意?

it is the first time i have ever been on a stage这个玩意到底是什么时态的?费解死我了,还有就是这个i knew immediately there'd been a mistake 这个里面的there'd展开是什么玩意?
主句 It is the first time是一般现在时
从句 I have ever been on a stage是现在完成时
第二句there'd展开是there had,这从其后的been就可以判断出来了.

have done结构是现在完成时时态。后面的句子展开应该是I knew immediately there had been a mistake. had done是过去完成时噢

这是我第一次上舞台。
我立刻知道出了一个错误。

现在完成时态。
had been a mistake