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Your sentence
他 喝 了 三 杯 咖啡
Words in this sentence
他
(third-person singular) (since the early 20th century, usu. male) he; him; his; (bound form) other; another; some other (as in 他日 (tārì) and 他人 (tārén))
喝
to drink
了
(completed action marker); (modal particle indicating change of state, situation now); (modal particle intensifying preceding clause)
Particle
三
three; 3
杯
cup; trophy cup; classifier for certain containers of liquids: glass, cup
咖啡
(loanword) coffee