Choose the correct answer

What is the key difference between ضَرَبَ, سَمِعَ and كَرُمَ in this level?

Foundations of the Past Tense Verb (Fi'l Maadhi)

• The vowel on the middle letter (عین کلمہ)
• The number of letters
• Whether they are nouns or verbs
• Whether the first letter exists