dothraki1-7  Exercise 2: Future and Negative Future
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Anha dothrak.    I ride.
Anha adothrak.   I will ride.         (a- before a consonant-initial verb)
Anha vos odothrok.  I will not ride.  (negative future: a- becomes o-;
                                       from the wiki's example)

Anha astak.      I say.
Anha vastak.     I will speak.        (v- before a vowel-initial verb;
                                       the wiki's example)
Negative future of astak (built by rule, vowel-initial keeps v-):
Anha vos vastok.  (check the dictionary)