"It seems that she was there at the conference." the sentence means thatshe seems to have been at the conference.Why?

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"It seems that she was there at the conference." the sentence means thatshe seems to have been at the conference.Why?
"It seems that she was there at the conference." the sentence means that
she seems to have been at the conference.
Why?

"It seems that she was there at the conference." the sentence means thatshe seems to have been at the conference.Why?
以现在的眼光看过去的事物-----现在的眼光---seems, 过去的事物---was,的时候,过去的事物就用to加完成时.又如 it seems that she worked here in 2009(主语从句)===== she seems to have worked here in 2009(简单句).it seems that he was here last wek==== he seems to have been here last week. ( ok了吗?)

主句现在时,从句过去时,所以说明是以前的事情,当时在。所以用不定时的完成时表示