Definition:
If any triliteral rooted verb's second and third of the three root letters is the same letter then that is defined as the doubled verb. When the third letter contains a vowel, then second and third letters are combined and written with a shadda over the second letter signifaying the doubling. Below given examples demonstrate this rule.

The dual form is not used in daily life. It is usually an academic interest. Therefore, we will skip the dual form from our tables.

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Verb=wadda=to love, masc=m, fem=f English Pronouns Arabic Pronouns   Perfect   Imperfect I anaa wadadtu awaddu Thou (m) anta wadadta tawaddu Thou (f) anti wadadti tawaddiyna He huwa wadda yawaddu She hiya waddat tawaddu We nahnu wadadnaa nawaddu You (m) antum wadadtum tawadduuna You (f) antunna wadadtunna tawdadna They (m) hum wadduu yawadduuna They (f) hunna wadadna yawdadna

Verb=shakka=to doubt   Perfect   Imperfect shakaktu ashukku shakakta tashukku shakakti tashukkiyna shakka yashukku shakkat tashukku shakaknaa nashukku shakaktum tashukkuuna shakaktunna tashkukna shakkuu yashukkuuna shakakna yashkukna

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