Webb20 dec. 2015 · Let me explain why this one is correct: the sentence uses "could have"; "could have" takes past participle; "took off" is past tense, so it cannot be used; "taken off" is past participle, so it could be used. I think I am clear now. Share. Improve this answer. Follow. edited Dec 20, 2015 at 14:12. answered Dec 20, 2015 at 13:53. Dinesh Kumar Garg. WebbThere are three different ways of pronouncing the -ed ending. The difference depends on the final sound we pronounce in the infinitive form, if it is voiced (when the vocal cords vibrate) or voiceless (when there is no vibration). You can try this by putting your fingers in your throat when pronouncing a word!
Why haven’t electric planes taken off yet? Electric aircraft …
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