If you were me, I could do it.
できるよ!
He seems to be something of a scholar.
You can do it that way.
A tumour forms [appears, makes its appearance] on some part of the body.
He is very much of a scholar―a great deal of a scholar.
出来ますか?
可能性はある
可能性もある
There's also the possibility
Anyone can do that.
やればできます!
彼ならできるでしょうが。