⏳ Grammar B1-3: Present perfect vs past simple

The decision material of the Fleydo B1 grammar series: present perfect or past simple, the contrast that decides more B1 marks than any other. The opening image is a pair of true sentences about the same art project — I finished it on Tuesday, a dated fact sealed inside last week, and I’ve finished it, news the present can still feel — with a timeline that draws the past simple as a sealed, named box and the present perfect as a line that reaches NOW. Both machines go on the bench side by side: a full comparison table of statements, negatives, questions and short answers, plus the time words each tense loves, and the half-built-perfect slip (has wrote). A four-step checklist — hunt for the time first — is walked through three worked runs, including the conversation swing: Have you ever been on TV? answered with the past simple and a date. The compare-and-verdict pair is the famous one — I’ve lost my keys against I lost my keys — with the recency rule attached: five minutes ago is still named time. A 95-word escape-room dialogue between Jade and Carlos shows the swing breathing in real talk, every tense tappable with its reason. Practice runs to thirty-one multiple-choice items in four sets, all explained, plus twelve time expressions to sort into sealed and open boxes, six real learner errors to repair, and three traps: the perfect with named time, the answer that must drop out of the perfect, and this morning changing tense at noon. Teacher notes give a 45-minute sequence, the box-and-arrow board move, the calendar-pointing rescue and Cambridge B1 Preliminary relevance.