he learns english by_____(sing)english songs.讲一下理由.

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he learns english by_____(sing)english songs.讲一下理由.

he learns english by_____(sing)english songs.讲一下理由.
he learns english by_____(sing)english songs.讲一下理由.

he learns english by_____(sing)english songs.讲一下理由.
singing
by后面接现在分词形式.

singing
介词后面动词加ing
呵呵,希望可以帮到你,有不懂的还可以问我^^

singing
by是介词,后跟动名词