Quote Originally Posted by Оля
Quote Originally Posted by tohca
врать = lie
вра+ (the + is where you add the endings of the noun or verb)
врать:

я вру
ты врёшь
он врёт
мы врём
вы врёте
они врут

Where is "вра" in these forms? In infinitive only. So no any additions to "вра" (in present tense).
Yes you are right. That Princeton Prof is a little 'off'. That's how it is in the study materials. Apart from this minor 'difficulty' I think the material is "первоклассный".