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I couldn't do vs I wasn't able to do

I couldn't do vs I wasn't able to do which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I couldn't do is the most popular phrase on the web.

I wasn't able to do

1600,000 results on the web

I couldn't do

145,400,000 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • I wasn't able to do the procedure that I'd hoped.
  • What I wasn't able to do.
  • I wasn't able to do anything.
  • what I wasn't able to do.
  • I wasn't able to do that for Amanda.
  • And if I wasn't able to do it properly, I'd be letting myself and you down.
  • He did what I wasn't able to do.
  • I couldn't do that to our daughter.
  • I couldn't do that to Mary Beth.
  • I couldn't do artificial respiration.
  • No, I couldn't do that to Nicole.
  • And I couldn't do other than I did.
  • Pools, raffles, card games, I couldn't do anything.
  • I couldn't do it to Damon.
  • I was her big brother, and I couldn't do anything.

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