فُوكَ — فَاكَ — فِيكَ
Translation: your mouth, in the three cases.
فُوكَ مُغْلَقٌ.
Translation: Your mouth is closed. «فُو» is the nominative subject/topic marked by wāw.
فَتَحْتَ فَاكَ.
Translation: You opened your mouth. «فَا» is the accusative object marked by alif.
نَظَرْتُ إِلَى فِيكَ.
Translation: I looked at your mouth. «فِي» is genitive, marked by yāʾ.
Additional clarification: This special form is فُو without mīm. When «فَمٌ» retains mīm, it normally declines «فَمٌ، فَمًا، فَمٍ».
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Noun Case Classes: Type 4 — The Six Nouns
فُوكَ — فَاكَ — فِيكَ
Translation: your mouth, in the three cases.
فُوكَ مُغْلَقٌ.
Translation: Your mouth is closed. «فُو» is the nominative subject/topic marked by wāw.
فَتَحْتَ فَاكَ.
Translation: You opened your mouth. «فَا» is the accusative object marked by alif.
نَظَرْتُ إِلَى فِيكَ.
Translation: I looked at your mouth. «فِي» is genitive, marked by yāʾ.
Additional clarification: This special form is فُو without mīm. When «فَمٌ» retains mīm, it normally declines «فَمٌ، فَمًا، فَمٍ».