Word: could in Isaiah

What could have been done more to my vineyard, that I have not done in it? wherefore, when I looked that it should bring forth grapes, brought it forth wild grapes?

Isaiah 7:1

And it came to pass in the days of Ahaz the son of Jotham, the son of Uzziah, king of Judah, that Rezin the king of Syria, and Pekah the son of Remaliah, king of Israel, went up toward Jerusalem to war against it, but could not prevail against it.

Isaiah 30:5

They were all ashamed of a people that could not profit them, nor be an help nor profit, but a shame, and also a reproach.

Isaiah 33:23

Thy tacklings are loosed; they could not well strengthen their mast, they could not spread the sail: then is the prey of a great spoil divided; the lame take the prey.

Isaiah 41:28

For I beheld, and there was no man; even among them, and there was no counsellor, that, when I asked of them, could answer a word.

Isaiah 46:2

They stoop, they bow down together; they could not deliver the burden, but themselves are gone into captivity.