Organise grammar and vocabulary around one controlling idea the audience can recover.
A paragraph or spoken section should advance one controlling idea. Use point, explanation, evidence/example, and link. Not every unit needs four visible sentences, but listener or reader should recover those functions.
Point: The release should move to Monday.
Explanation: Payment changes affect every order.
Evidence: Current tests cover new customers but not renewals.
Link: Two extra days reduce risk before the campaign.
Writing can carry denser noun phrases and visible paragraph structure. Speech needs shorter thought groups, signposting, repetition of key terms, and deliberate stress. Preserve message while adapting channel.
Every retained fact must support controlling idea. Grammar makes relationships precise; vocabulary makes content exact; cohesion makes connections recoverable; delivery makes structure audible.
Write first sentence and final sentence before middle. If they do not express same controlling idea, structure is not ready.
Use British Council B2 writing models and Digital.gov plain-language guidance.