This is the 3668th most frequent Portuguese word.
tivessem
"Tivessem" is the imperfect subjunctive form of "ter," meaning "had" (used in hypothetical or uncertain situations).
The word 'tivessem' is used in the subjunctive past tense to express a hypothetical situation referring to 'eles'.
Se eles tivessem mais tempo, poderiam terminar o trabalho.
If they had more time, they could finish the work.
The word 'tivessem' here is in the subjunctive past tense, reflecting a wish or regret about past events.
Gostaria que meus amigos tivessem vindo à festa.
I wish my friends had come to the party.
The usage of 'tivessem' conveys a desired or necessary action in relation to a past event, used in conjunction with 'estudado' for completion emphasis.