🎞️ Grammar B1-27: Third conditional

The twenty-seventh material of the Fleydo B1 grammar series. It teaches the third conditional as a rewind button: the past already happened, and this sentence replays it with one detail changed — which is why nothing in it can ever come true, and why English keeps it for regret, relief and near misses. The form is built as two halves with four verb parts: if + past perfect in the if-half, would have + past participle in the result, with a full table of statements, negatives, questions and short answers. A four-step decision procedure — find the fact, check the door is closed, rewind the if-half, imagine the result — is walked through three worked examples, one of which faces the double had had plainly: the first had is the helper, the second is the real verb. The compare-and-verdict pair puts If I had more time, I’d help against If I had had more time, I’d have helped — the still-open second conditional against the sealed third. A dedicated section cracks the contraction code: ’d is had before a bare participle and would before have, taught through a decoding rule and eight commit-then-check cards. Practice spreads thirty-one explained multiple-choice items over four sets, plus ten situations sorted into still-open against sealed-in-the-past, six real learner repairs — would have leaking into the if-half among them — and three traps ending with would of. A 129-word story of near misses and one regret shows eight rewinds in connected writing. Teacher notes give a 45-minute sequence, the rewind-arrow board move, the fact-flip-step-back rescue and Cambridge B1 Preliminary relevance.