is the adverb of frequency in the right place? we eat lunch at the cafeteria always.

The adverb of frequency "always" is not in the right place in the sentence "We eat lunch at the cafeteria always." The correct placement for an adverb of frequency in a sentence like this is typically before the main verb. So the correct sentence should be: "We always eat lunch at the cafeteria." Adverbs of frequency like "always," "usually," "often," "sometimes," and "never" are placed before the main verb in most cases, except when the verb is "to be," in which case the adverb comes after the verb.