Why does てはいけない use は? I know it's a construction, but where did it come from?
て form verbs are not nouns, it doesn't make sense to me that は could be used
with them.
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2013-08-07T01:52:33.657
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2014-11-26T05:05:34.137
2014-11-26T05:05:34.137
question
grammar て-form particle-は
Why is は appropriate for てはいけない?
THe は in ～てはいけない. Is actually not the topic marking particle, but a different
particle entirely. IT's kind of like how the particle に has a number of
different uses. In this case the は is used to emphasize the negative part of
the sentence. You'll see in other places が being replaced by は before ない or
another negative verb or adjective.

Edit: I found some more information on the subject. [This
website](http://www.learn-japanese-adventure.com/japanese-particles-
change.html) does a good job discussing this concept as I understand it.
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2013-08-08T05:08:36.373
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2013-08-08T14:46:34.930
2013-08-08T14:46:34.930
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answer