The final radical of this word is guttural; this affects the adjacent vowels.
Singular
Plural
Absolute State
אַרְבָּעָה
arba'a
four m.
אַרְבַּע
arba
four f.
Conjugate State
אַרְבַּעַת
arba'at
(the) four m. of
אַרְבַּע
arba
(the) four f. of
Masculine
Feminine
Person
אַרְבַּעְתֵּנוּ
arba'atenu
the four of us
אַרְבַּעְתְּכֶם
arba'atchem
the four of you m. pl.
אַרְבַּעְתְּכֶן
arba'atchen
the four of you f. pl.
אַרְבַּעְתָּם
arba'atam
the four of them m.
אַרְבַּעְתָּן
arba'atan
the four of them f.
1st (I) Person
אַרְבַּעְתֵּנוּ
arba'atenu
the four of us
2nd (You) Person
Masculine
אַרְבַּעְתְּכֶם
arba'atchem
the four of you m. pl.
Feminine
אַרְבַּעְתְּכֶן
arba'atchen
the four of you f. pl.
3rd (He/She) Person
Masculine
אַרְבַּעְתָּם
arba'atam
the four of them m.
Feminine
אַרְבַּעְתָּן
arba'atan
the four of them f.
Word
Root
Part of speech
Meaning