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Why parallel structure for "OR" didn`t use here:
Operant conditioning involves rewarding or punishing certain behavior to reinforce OR extinguish its occurrence.
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But it is parallel; in fact, there are two sets of parellelisms:

Operant conditioning involves (1) rewarding or punishing certain behavior to (2) reinforce or extinguish its occurrence.

What confuses you?
In the second: TO reinforce OR (TO) extinguish
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The verb forms remain parallel; the second infinitive particle is merely ellipted.
It`s OK but in the second i think we should have another "to" :

to reinforce or TO extinguish

Both "reinforce" and "extinguish" are verb then must have the same structure.
please disregard my previous post.

OK, but i on the test how can recognize this?

By grammar rules both of them should have same structure.
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Operant conditioning involves ( 1 ) rewarding or punishing certain behavior to ( 2 ) reinforce or extinguish its occurrence.

If you mean that ( 1 ) and ( 2 ) above should have the same structure, that is not true, since they are not in parallel positions; they are at different levels in the sentence. 2 is subordinate to 1.
Operant conditioning involves rewarding or punishing certain behave to reinforce or extinguish its occurrence.
anonymous Operant conditioning involves rewarding or punishing certain behave to reinforce or extinguish its occurrence.

Please don't add posts that contain nothing but a quotation of the original question. It adds nothing to the discussion to ask the same thing again, especially when the answer has already been given, and that was eight years ago.

Thread locked.

CJ

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