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What kind of words can we use to express the frequency in which one event/idea happens? Where do we have to put these words in a sentence (position of these words in relation to the other things - verb and subject)?
Adverbs (sometimes, always, never, often, usually, normally, generally, rarely,...). We put these words between the subject and the verb. But when we have a sentence with verb to be, we have to put these adverbs after verb to be.