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The grammar that trips people up, explained once.
Every post comes from a real section of the course — the same examples, the same Say this / Not this pairs you’ll practise in the app.
Tenses1.6 · Present Perfect vs Past Simple
Present Perfect vs Past Simple: the distinction that trips everyone up
One is about a finished moment, the other about a result you're still carrying. Here's the test that decides it in a second — and the three sentences learners always get backwards.
Aug 4, 2026 · 6 min read
Say this
I've lost my keys.
Not this
I've lost my keys yesterday.
A finished time word forces Past Simple: I lost my keys yesterday.
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