Past verb
Present verb
Idiomatic meaning
صَدَقَ
يَصْدُقُ
he spoke truth / he speaks truth
كَذَبَ
يَكْذِبُ
he lied / he lies
شَكَرَ
يَشْكُرُ
he thanked / he thanks
نَقَصَ
يَنْقُصُ
he reduced / he reduces
تَرَكَ
يَتْرُكُ
he left / he leaves
صَدَقَ and كَذَبَ express opposite kinds of speech. Their meanings are opposite, and their present weights are also different.
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Fa'ala Verbs - Part 2: Complete the Group
Past verb
Present verb
Idiomatic meaning
صَدَقَ
يَصْدُقُ
he spoke truth / he speaks truth
كَذَبَ
يَكْذِبُ
he lied / he lies
شَكَرَ
يَشْكُرُ
he thanked / he thanks
نَقَصَ
يَنْقُصُ
he reduced / he reduces
تَرَكَ
يَتْرُكُ
he left / he leaves
صَدَقَ and كَذَبَ express opposite kinds of speech. Their meanings are opposite, and their present weights are also different.