I have a question about the position of the adverb.

"I think I could EASILY pass the test."
"I was able to answer the questions CORRECTLY."
"I will continue studying HARD."

Should I put the adverb before the verb or the last of sentence?

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There are 4 parts to an adverb

Adverb of formality/manner (easily, quickly, carefully etc)
- Put in front of the direct object or the verb if there is no direct object.
e.g "He finished the test easily". The test = direct object

Adverb of Place (here, there, over there, where etc)
- Same as manner, put the adverb in front of/after the direct object or the verb.
e.g "He went over there"

Adverb of Time (recently, lately, today etc)
- Adverbs of time are usually put at the end of the sentence.
e.g "Are you coming to the party tomorrow?"
"What have you been doing lately?"

Adverb of Frequency (seldom, rarely, often, sometimes etc)
- Put directly behind/before the main verb (there could be two verbs in a sentence thus the "main" verb). This works when the main verb is "be".
e.g "The concert will often be held around this time of the year"
"Do you always practice in the mornings?"