When we underline the adverb, here is what we have:
Church bell ringers were frequently killed by lightning.
- An adverb is a word that modifies a verb, an adjective, or another adverb.
- Adverbs can indicate, among other things, manner, place, time, frequency, etc.
- In the sentence we are analyzing here, the adverb is "frequently", which indicates the frequency with which the action - being killed by lightning, happened.
- Therefore, we should underline "frequently".
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