Then call thou, and I will answer - Call me to trial; summon me to make my defense. This is language taken from courts of justice, and the idea is, that if God would remove his calamity, and not overawe him, and would then call on him to make a defense, he would be ready to respond to his call. The language means, "be thou plaintiff in the case, and I will enter on my defense." He speaks now to God not as to a judge but as a party, and is disposed to go to trial. See the notes at Job 9:33-35.
Or let me speak, and answer thou me - "Let me be the plaintiff, and commence the cause. In any way, let the cause come to an issue. Let me open the cause, adduce my arguments, and defend my view of the subject; and then do thou respond." The idea is, that Job desired a fair trial. He was willing that God should select his position, and should either open the cause, or respond to it when he had himself opened it. To our view, there is something that is quite irreverent in this language, and I know not that it can be entirely vindicated. But perhaps, when the idea of a trial was once suggested, all the rest may be regarded as the mere filling up, or as language fitted to carry out that single idea, and to preserve the concinnity of the poem. Still, to address God in this manner is a wide license even for poetry. There is the language of complaint here; there is an evident feeling that God was not right; there is an undue reliance of Job on his own powers; there is a disposition to blame God which we can by no means approve, and which we are not required to approve. But let us not too harshly blame the patriarch. Let him who has suffered much and long, who feels that he is forsaken by God and by man, who has lost property and friends, and who is suffering under a painful bodily malady, if he has never had any of those feelings, cast the first stone. Let not those blame him who live in affluence and prosperity, and who have yet to endure the first severe trial of life. One of the objects, I suppose, of this poem is, to show human nature as it is; to show how good people often feel under severe trial; and it would not be true to nature if the representation had been that Job was always calm, and that he never cherished an improper feeling or gave vent to an improper thought.

Then call thou - Begin thou first to plead, and I will answer for myself; or, I will first state and defend my own case, and then answer thou me.

Then call thou, and I will answer,.... Either call him by name in open court, and he would answer to it; or arraign him at the bar, and exhibit charges against him, and he would make answer to them and clear himself; his sense is, that if God would take upon him to be plaintiff, and accuse and charge him with what he had to object to him, then he would be defendant, and plead his own cause, and show that they did not of right belong unto him:
or let me speak, and answer thou me: or he would be plaintiff, and put queries concerning the afflictions he was exercised with, or the severity of them, and the reason of such usage, and God be the defendant, and give him an answer to them, that he might be no longer at a loss as he was for such behaviour towards him: this is very boldly said indeed, and seems to savour of irreverence towards God; and may be one of those speeches for which he was blamed by Elihu, and by the Lord himself; though no doubt he designed not to cast any contempt upon God, nor to behave ill towards him; but in the agonies of his spirit, and under the weight of his affliction, and to show the great sense he had of his innocence, and his assurance of it, he speaks in this manner; not doubting but, let him have what part he would in the debate, whether that of plaintiff or defendant, he should carry the cause, and it would go in his favour; and though he proposes it to God to be at his option to choose which he would take, Job stays not for an answer, but takes upon him to be plaintiff, as in the following words.

call--a challenge to the defendant to answer to the charges.
answer--the defense begun.
speak--as plaintiff.
answer--to the plea of the plaintiff. Expressions from a trial.

Then - This proposal savoured of self - confidence, and of irreverence towards God; for which, and the like speeches, he is reproved by God, Job 38:2-3, Job 40:2.