He is the teacher
Okay, let's put the words together.
ἐστιν ὁ διδάσκαλος
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What do you think ἐστιν ὁ διδάσκαλος means? Right. It means, "He is the teacher."
Important: keep saying these words out loud. You need to say it, hear it, and write it. Use all your senses.