Present perfect vs past simple

Two ways to look at the past

• The diagram contrasts saw it yesterday with have seen it. Its label no time means this perfect example gives no finished event time; it does not ban time references such as for a year.
• The past simple can place an event in a finished past period. The present perfect looks back from now, for example at experience or a current result. Past-simple events can also have consequences now.
• I saw it yesterday. / I have seen it. Outcome: choose a viewpoint while preserving the facts. Start with past simple and present perfect. Allow 35–50 minutes across sessions.

I lost my keys yesterday; I have found three old receipts since.

Finished time → past simple

• Use the past simple with a finished past time.
• yesterday, last week, in 2019, two days ago.
• We met in 2018. She called an hour ago.

Connected to now → present perfect

• Use the present perfect to look back from now, for example when describing experience up to now or a result that matters now. A finished past-time phrase needs a different viewpoint.
• I have visited Japan. He has just left.
• It matters now — the result or the experience. Past simple can also describe recent events, especially in American English; being recent does not force a perfect form.

Clues, not automatic switches

• Past simple: yesterday, … ago, last …, in 2019.
• Words such as already, ever and for are clues, not tense rules by themselves. Compare I lived there for a year (a finished period) with I have lived here for a year (a period reaching now).
• In ordinary standard usage, do not attach yesterday or an hour ago directly to the present-perfect event: say I finished it yesterday.

Common mistakes

• To ask the time of one completed arrival, use When did you arrive? A different question, such as When have you ever arrived early?, can use present perfect; the word when itself does not ban it.
• ❌ This is the first time I go here. → ✓ …the first time I have been here.
• I finished just now and I have just finished are useful patterns. I just finished is also common, especially in American English. Read the context rather than choosing from just alone.

Grammar guidance checked 2026-10-20: British Council, present perfect.

Worked contrasts: three decisions

• A consequence now: I dropped my phone yesterday, so the screen is cracked now still uses past simple for the dated event. A duration: I lived there for a year, then moved away describes a finished period; I have lived here for a year and still live here explicitly reaches now.
• A recent event: I've just sent the photo and I just sent the photo can both be natural, with the latter especially common in American English. Read the form and context; do not replace every past-simple sentence containing just.

Independent decisions

• Read what is stated and what form is requested. A grammatical alternative can miss an explicitly requested form without being wrong in every context.
• After a miss, identify whether you changed the time viewpoint, chose the wrong verb form or inferred a rule from one signal word. Then try the fresh contexts.

Transfer: two viewpoints in one message

• Use the notes to report one finished event and one experience up to now in English. Keep the time and the experience facts separate.
• Reveal the comparison after writing; check a specific mismatch and revise it. Models show possible answers rather than a required script.

Return later and check the evidence

• Tomorrow, recall an ordinary past-simple report, a present-perfect experience and a grammatical past-simple example with just or already. Then try the bag task before rereading.
• Next: present perfect continuous. A written self-review does not establish correctness or certify proficiency.

Usage comparison checked 20 October 2026: Cambridge, present perfect or past simple. Original examples; independent grammar/key/learner review pending.