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现在完成进行时 underlay






现在完成进行时

I have been underlaying



现在完成进行时 (Present perfect continuous)

I
have been underlaying 
you
have been underlaying 
he/she/it
has been underlaying 
we
have been underlaying 
you
have been underlaying 
they
has been underlaying 


不定式

underlay









不规则动词