'Seem' is too difficult for me!

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Mar 20, 2017 23:12
I saw some confusing sentences;
"It seems cool"
"She seems happy" (corrected by SwethaS thx)
"She seems to be happy"

And I can't understand subtle difference between them.
I think their grammar aren't wrong.
Why 'she' can use both active form and passive form?
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