'Art' in the Bible

And he went out on the second day, and behold, two Hebrew men were quarrelling; and he said to him that was in the wrong, Why art thou smiting thy neighbour?

Then Zipporah took a stone and cut off the foreskin of her son, and cast it at his feet, and said, A bloody husband indeed art thou to me!

And Moses' father-in-law saw all that he did with the people, and said, What is this thing which thou art doing with the people? why dost thou sit alone, and all the people are standing by thee from morning to evening?

And Moses' father-in-law said to him, The thing that thou art doing is not good.

By little and little I will drive them out from before thee, until thou art fruitful, and possess the land.

into a land flowing with milk and honey; for I will not go up in the midst of thee, for thou art a stiff-necked people, lest I consume thee on the way.

And he said, Behold, I make a covenant: before all thy people I will do marvels that have not been done in all the earth, nor in any nation; and all the people in the midst of which thou art shall see the work of Jehovah; for a terrible thing it shall be that I will do with thee.