Gerunds, past participles, compound perfect tenses and the passive

The gerund of all verbs is formed by replacing the final r of the infinitive with -ndo:

falar ‘to speak’ > falando ‘speaking’

fazer ‘to do’ > fazendo ‘doing’

ir ‘to go’ > indo ‘going’

pôr ‘to put’ > pondo ‘putting’ (written accent dropped).