"We can't command our love, but we can our actions." Why he can eliminate the verb after "can"?

"We cant command our love, but we can our actions." This is a quote of Arthur Conan Doyle.As usual, after modal verb should be a bare infinity. But i

"We can't command our love, but we can our actions."
This is a quote of Arthur Conan Doyle.
As usual, after modal verb should be a bare infinity. But in this case, It's a noun phrase.
Why can he eliminate the verb after "can"?
I don't know with English structure can explain it.

or:\"We can't command our love, but we can our actions.\" This is a quote of Arthur Conan Doyle.As usual, after modal verb should be a bare infinity. But in this case, It's a noun phrase.Why can he eliminate the verb after \"can\"?I don't know with English structure can explain it.

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