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مصدر اِبْتِساماً Bab باب Form تَبَسَّمْتُ I Smiled

Text تَبَسَّمْتُ اِبْتِساماً (I smiled)

Here the word that deputizes for مصدر is اِبْتِسَاماً because it is مصدر of مزيد (bab) which is different from the (bab) of the verb.
Back Extra Here اِبْتِساماً is مصدر of the verb اِبْتَسَمَ which belong to باب اِفْتَعَلَ (form VIII), whereas the تَبَسَّمَ belongs to باب تَفَعَّلَ (form V), and both have the same meaning.
Personal Notes Remember it should be a cognate مصدر for it to deputize for مصدر, thus meaning is the same.

Tags: @aranki::madina::book3::grammar::lesson_28

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