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English · Quick Reference
Lesson 9 — Tense Challenge Cheat Sheet
In one line: Most tense errors come from ignoring signal words — "since," "yesterday," "by the time" each demand one specific tense.
Signal Word → Tense
1yesterday/ago. Past Simple.
2since + point. Perfect (Present or Past).
3for + duration. Perfect Continuous.
4by the time. Past/Future Perfect.
Frequent Fixes
Did you ever visit Paris? ✗
Have you ever visited Paris?
She has graduated in 2022. ✗
She graduated in 2022.
Waiting since 3 hours. ✗
Waiting for 3 hours.