Here are some examples of the casual form for RU verbs in the present tense affirmative and negative:

おきる (to get up) : affirmative – おきる. Negative – おきない

ねる (to sleep) : affirmative – ねる. Negative – ねない

みる (to see) : affirmative – みる. Negative – みない

Did you notice that the casual form in the affirmative for RU verbs were the same as the infinitive? Also, the casual form of the negative for RU verbs was formed by dropping the る and adding ない to the stem.

Now let’s look at the casual forms of U verbs in the affirmative and the negative.

やすむ (to rest) : affirmative – やすむ. Negative – やすまない

しぬ (to die) : affirmative – しぬ. Negative – しなない

あう (to meet) : affirmative – あう. Negative – あわない

はこぶ (to carry) : affirmative – はこぶ. Negative – はこばない

さがす (to search) : affirmative – さがす. Negative – さがさない

かく (to write) : affirmative – かく. Negative – かかない

およぐ (to swim) : affirmative – およぐ. Negative – およがない

まつ (to wait) : affirmative – まつ. Negative – またない

The casual form of the affirmative for U verbs are the same as the infinitive forms of the verbs. Unfortunately, the casual form of the negative for U verbs are not so easily formed as the RU verbs. If you look at やすむ (to rest) as an example, the negative was formed by changing the む to ま and adding ない. The same will occur in the casual negative of verbs that fall into this category of verbs. For example, take the ぬ of しぬ (to die) and change it to a な. Then add ない. Likewise, change the う in あう (to meet) to わ and add ない.

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