The word which creates the verb mood error in the sentence is was.
The sentence "If I was able to do it all over again, I would study the week before the test" means the speaker is seeking for a second chance to do a test all over again. The speaker said he would read the week before the test so he can pass.
What is a verb?
A verb is a part of speech indicating action in a sentence. So, a verb is an action word or a doing word. Examples of verbs are, was, is, run, walk, jump, speak, dance, write, sleep etc.
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