1 (wiktionary) 2 (de.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Verbs Nouns Adjectives/Adverbs Pronouns Prepositions Conjunctions
perhaps (Advanced search)

NGSL3000 perhaps Possibly, but not certainly; maybe adv
SAT5000 perhaps Possibly. adv.

Tanaka6000 perhaps

perhaps {adv} (indicating a lack of certainty)

Perhaps it will rain tomorrow .
Perhaps he knows this story .
Perhaps I'll like this book .
Perhaps it will rain in the afternoon .
Perhaps he'll never become famous .