It would have been better if he hadn't included the famous double slash, if he hadn't put it in, it would have saved millions of computer strokes, If he hadn't invented it at all, a lot of people could have been happier, If he hadn't invented it at all, someone else might have done , If we had planned it better from the start, we would have developed better systems, If they had left earlier, they would have caught the train., If I had known about the meeting, I would have attended it.,

11.3 level 8, Third conditional

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