Поставить глаголы в форме Present Participle и Past Participle.
to see
to feel
to sit
to work
to do
to understand
to discus
to know
to smell
to cry
to see
to feel
to sit
to work
to do
to understand
to discus
to know
to smell
to cry
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Present Participle Perfect: having seen, having felt, having sat, having worked, having done, having understood, having discussed, having known, having smelt, having cried
Past Participle: seen, felt, sat, worked, done, understood, discussed, known, smelt, cried