In this short slideshare I go over how to form the casual negative tense of verbs in Japanese and the irregular いい adjective.

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I forgot to mention one thing in the
previous video. Sorry about that.
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I didn't tell you about casual negative
tense. But, it's really easy.
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For i-adjectives, you just cut the い
off and add くない , like so:
あまい → あま + くない → あまくない
amai → ama + kunai → amakunai

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There is one odd ball to be aware of
though – いい , which means good in
Japanese...
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...has an irregular negative form. It
changes from いい to よい .
いい – good よくない – not good
ii yokunai