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How do I use 'how else'? If I'm referring to the past but I don't want a conditional which one would I use?

1. How else would I know if she downloaded it or not?

2. How else would I have known if she downloaded it or not?

2. How else would I have known if she had downloaded it or not?

Thanks.
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Jack112How do I use 'how else'? If I'm referring to the past but I don't want a conditional which one would I use?

1. How else would I know if she downloaded it or not?

2. How else would I have known if she downloaded it or not?

2. How else would I have known if she had downloaded it or not?

Thanks.

# 1 is fine. The second #2 Emotion: winkis far better than the first #2, according to my rules regarding sequence of tenses.
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Just as a supplement:

The second #2 places the imaginary 'alternative knowing' in the past, whereas #1 doesn't restrict it.

The first #2 sounds odd to me too.

MrP