Amy can sing many English songs now.的过去式

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Amy could sing many English songs in the past
======以下答案可供参考======
供参考答案1:
Amy could sing many English songs
供参考答案2:
Amy could sing many English songs
.因为could是情态动词，所以后面要用sing而不用sang.
帮帮忙，给点分吧
供参考答案3:
Amy could sang many English songs.