should have done（should have done 和could have done）

could,should,would have_doneppt

could,should,would have_doneppt

归纳总结 done意为 本来能够, 意为: could have done意为: 本来能够

"情态动词 have done"重点讲解

情态动词 have done用法

could should would have_done

have done… must have done can/ could not have done should

could,should,would have_doneppt

情态动词 have_done的用法

might have done