present perfect, past simple, present perfect continues

Question

I cannot understand these.
1st

We didn't win our first four games, but now we are second in the league.  (o)
We haven't win our first four games, but now we are second in the league. (x)

2nd

For the last half hour I have been watching some dolphins near the boat, and I feel really happy to be here. (o)
For the last half hour I have watched some dolphins near the boat, and I feel really happy to be here. (x)

Why each first line is correct?

Kate Bunting · Accepted Answer

(1) It should be haven't won, but this would only be said after those four games and before any more have been played. "Now we are second in the league" implies that the team have won plenty of games since those four losing ones. Didn't win is used because the losing games were some time in the past.
(2) Similarly, the half hour of dolphin-watching is in the immediate past (and may still be continuing!).

present perfect, past simple, present perfect continues

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