40 questions mastering the "by" trigger for Future Perfect. Learn to distinguish "by [deadline]" from "at [moment]".
Some sentences are affirmative (will have + pp), some are questions (Will subject have + pp?). Watch for the 'by [time]' trigger and the context.
| Signal word | Tense | Meaning |
|---|---|---|
| by [time] | Future Perfect | Completed before that point |
| by the time… | Future Perfect | Completed before the other event |
| by then | Future Perfect | Completed before a mentioned future time |
| at [time] | Future Continuous | In progress at that exact moment |
| when… | Future Continuous | In progress when the other event occurs |
| at exactly… | Future Simple | Happens at that moment |