Eph 4: 20

(KJV)
But ye have not so learned Christ;
(NASB2020)
But you did not alearn Christ in this way,
(NET2full)
But you did not learn about Christ like this,

Eph 4: 21

(KJV)
If so be that ye have heard him, and have been taught by him, as the truth is in Jesus:
(NASB2020)
if indeed you bhave heard Him and have cbeen taught in Him, just as truth is in Jesus,
(NET2full)
if indeed you heard about him and were taught in him, just as the truth is in Jesus.

Eph 4: 22

(KJV)
That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts;
(NASB2020)
that, in reference to your former way of life, you are to drid yourselves of the eold
Lit person
self, which is being corrupted in accordance with the glusts of deceit,
(NET2full)
You were taught with reference to your former way of life to lay aside
tn An alternative rendering for the infinitives in vv. 22-24 (“to lay aside…to be renewed…to put on”) is “that you have laid aside…that you are being renewed…that you have put on.” The three infinitives of vv. 22 (ἀποθέσθαι, apothesthai), 23 (ἀνανεοῦσθαι, ananeousthai), and 24 (ἐνδύσασθαι, endusasthai), form part of an indirect discourse clause; they constitute the teaching given to the believers addressed in the letter. The problem in translation is that one cannot be absolutely certain whether they go back to indicatives in the original statement (i.e., “you have put off”) or imperatives (i.e., “put off!”). Every other occurrence of an aorist infinitive in indirect discourse in the NT goes back to an imperative, but in all of these examples the indirect discourse is introduced by a verb that implies a command. The verb διδάσκω (didaskō) in the corpus Paulinum may be used to relate the indicatives of the faith as well as the imperatives. This translation implies that the infinitives go back to imperatives, though the alternate view that they refer back to indicatives is also a plausible interpretation. For further discussion, see ExSyn 605.
the old man who is being corrupted in accordance with deceitful desires,

Eph 4: 23

(KJV)
And be renewed in the spirit of your mind;
(NASB2020)
and that you are to be irenewed in the spirit of your minds,
(NET2full)
to be renewed in the spirit of your mind,
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