The Little Gold Grammar Book(Verb Tenses, Rue 38)

Rule 38: 현재 완료 시제에서는 동사 "has" 또는 "have"를, 과거 완료 시제에서는 조동사 "had"를,
그리고 미래 완료 시제에서는 동사형인 "will have"를 씁니다.

Q73: We are raising money for the new scholarship fund. So far we (raised / have raised / had raised) $25,000.
우리는 새로운 장학금 기금을 모금하고 있는 중입니다. 현재까지 25,000불이 모금됐습니다.
A73: We are raising money for the new scholarship fund. So far we have raised $25,000.

Q74: By the time I began playing golf, I (played / had played) tennis for three hours.
내가 골프를 치기 시작했을 때, 나는 이미 세 시간 동안 테니스를 쳤습니다.
A74: By the time I began playing golf, I had played tennis for three hours.

Q75: Larry (studied / has studied / had studied) Russian for five years before he went to work in Moscow.
래리가 모스코로 일하러 가기 전 5년동안 그는 러시아어를 공부했었습니다.
A75: Larry had studied Russian for five years before he went to work in Moscow.

Q76: By the time evening arrives, we (finished / had finished / will have finished) the task at hand.
저녁때가 될 무렵, 우리는 주어진 일을 마칠 겁니다.
A76: By the time evening arrives, we will have finished the task at hand.

Excerpt From
The Little Gold Grammar Book
Brandon Royal
https://books.apple.com/us/book/the-little-gold-grammar-book/id466973157
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