English verb conjugation

sightsee

irregular
"To go sightseeing; to visit places of interest in a city, town or geographical area" — irregular English verb

Indicative

Present
3rd sg.sightsees

Non-finite

Past participle
sightseen
Present participle
sightseeing
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Conjugation data from Kaikki.org (extracted from English Wiktionary), licensed CC BY-SA 4.0.