'Shall' in the Bible

“From the days of your fathers you have turned aside from My statutes and have not kept them. Return to Me, and I will return to you,” says the Lord of hosts. “But you say, ‘How shall we return?’

“All the nations will call you blessed, for you shall be a delightful land,” says the Lord of hosts.

You will tread down the wicked, for they will be ashes under the soles of your feet on the day which I am preparing,” says the Lord of hosts.