The core idea — the deadline in the past
Imagine you are standing at a specific moment in the past — say, 9pm on a Tuesday. You look back and ask: "What was already done by this point?" Whatever was finished before that moment — the answer to that question — uses the Past Perfect.
This is a very specific and precise use of the Past Perfect. Instead of comparing two events (as in Situation 1), you are measuring an action against a fixed point in time. The action was completed before that point. The point itself is the reference — a deadline in the past.
The action was completed before the time reference point:
"By 9pm, she had finished the entire report."
The key signal: "by"
The word by is the most important signal for this use. By means "not later than" — it sets a deadline. When by introduces a past time, the action described is almost always in the Past Perfect.
By 9pm, she had finished the report.
By the end of the week, they had sold all the tickets.
By the time he retired, he had saved enough to buy a house.
By the age of thirty, she had written three novels.
How does this differ from Situation 1?
In Situation 1, you compare two events — one happened before the other. Here, you compare one event against a fixed time reference — a clock time, a date, an age, or a milestone. The reference point is not another action; it is a moment in time.
Before a specific time (this situation)
By 9pm, she had finished.
→ The reference point is a fixed time: 9pm. We measure the completion against that deadline.
Before another action (Situation 1)
When I called, she had finished.
→ The reference point is another event: my phone call. We measure completion against a different action.
Affirmative sentences
- By 9pm, she had finished the entire report.
- By the end of the day, they had sold over five hundred tickets.
- By the time he retired, he had saved enough to buy a house outright.
- By the age of thirty, she had written three novels.
- By the end of the charity run, the participants had raised over ten thousand pounds.
Negative sentences
By 9pm, she hadn't finished — she was still working.
By the deadline, he hadn't written a single word.
- By the end of the day, they hadn't sold half the tickets — sales were slow.
- By the deadline, he hadn't finished the first draft, let alone the final version.
- By the time we arrived, nobody hadn't received any warning — they were completely unprepared.
- By the age of thirty, she hadn't written a single word — she started late.
- By the end of the trip, she hadn't spent much at all — she was careful with money.
Interrogative sentences
Had she finished by 9pm? · Had they sold all the tickets by the end of the day?
Wh- questions: Question word + had + subject + past participle + by [time] + ?
How much had she raised by the end of the run?
How many novels had she written by the age of thirty?
- Had she finished the report by 9pm?
- How many tickets had they sold by the end of the day?
- How many novels had she written by the age of thirty?
- Had he saved enough to retire by the time he turned sixty?
- How much had she spent by the end of the trip?
Key time expressions for this use
Common mistakes to watch out for
✗ By 9pm, she finished the report.
✓ By 9pm, she had finished the report.
When by introduces a past time and you want to say something was completed before that point, always use the Past Perfect. The Past Simple finished sounds like the finishing happened exactly at 9pm — not before it. The Past Perfect had finished clearly means: the report was done before 9pm arrived.
✗ She worked until 9pm, so she had finished by then. → ✓ (correct)
✗ By 9pm, she was still working. → ✗ (contradiction)
✓ By 9pm, she had finished. (= completed before 9pm)
✓ She worked until 9pm. (= continued up to 9pm, then stopped)
By means the action was completed no later than that point. Until means the action continued up to that point. They describe opposite situations. If something was done by 9pm, it was finished before 9pm. If someone worked until 9pm, they were still working at 9pm and stopped then.
✗ By 9pm, she has finished the report.
✓ By 9pm, she had finished the report.
The Present Perfect (has finished) connects the past to the present moment — now. But by 9pm refers to a point in the past, not now. To talk about completion before a past time reference, always use the Past Perfect (had finished), not the Present Perfect.
✗ By the age of thirty, she had wrote three novels.
✗ By the end of the decade, he had drank the whole bottle.
✓ By the age of thirty, she had written three novels.
✓ By the end of the evening, he had drunk the whole bottle.
The Past Perfect always requires the past participle — the third form of the verb. For irregular verbs: write → written (not wrote), drink → drunk (not drank), fly → flown (not flew), choose → chosen (not chose). Check irregular verb lists carefully.