He said that he had been teaching .(Into Active voice)​

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Explanation:

The active voice describes a sentence where the subject performs the action stated by the verb. It follows a clear subject + verb + object construct that's easy to read. In fact, sentences constructed in the active voice add impact to your writing. With passive voice, the subject is acted upon by the verb. Active voice is a grammatical voice common in many of the world's languages. It is the unmarked voice for clauses featuring a transitive verb in nominative–accusative languages, including English and most other Indo-European languages Active voice examples

The dog chased the squirrel. All three sentences have a basic active voice construction: subject, verb, and object. The subject monkey performs the action described by adore. The subject the cashier performs the action described by counted.

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In nitrogen-14, there are 7 protons, 7 neutrons, and 7 electrons. The protons and neutrons are in the nucleus, and the electrons are in the electron shells. The atomic number is the number of protons, the mass number is the number of protons AND neutrons, and the atomic mass is the average of the masses of all isotopes.