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Structure: ‘Present perfect vs past simple’

Present perfect or past simple?

Both tenses talk about the past, but they do different jobs. We use the present perfect for past actions that are connected to now — a result, an experience, or news that still matters. We use the past simple for finished actions at a definite time in the past.

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Rolls-Royce and easyJet Prove a Jet Engine Can Run on 100% Hydrogen

easyJet and Rolls-Royce have successfully run a commercial jet engine entirely on hydrogen, marking a major milestone in the push toward cleaner aviation.

easyJet and Rolls-Royce have completed a major milestone in sustainable aviation: they ran a modern commercial jet engine on pure hydrogen from start-up through takeoff power and back down again. The test, which took place in late April 2026, is a significant step toward cleaner air travel.

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