I've been studying Japanese for about two years, and recently started working
though Japanese Duolingo. I'm confused by their particle usage for verbs:

> 魚を食べます

versus

> 魚は食べません

I.e using を for positive verbs and は for negative verbs. Is this standard, an
idiosyncrasy of Duolingo, or wrong?
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2017-06-21T15:05:34.943
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2017-06-21T19:00:57.757
2017-06-21T19:00:57.757
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question
particles verbs particle-は
Can you use は to mark the object with negative verbs?