電話するの を 忘れて ごめん なさい。denwasuruno o wasurete gomen nasai.
Please forgive me for forgetting to call you.
Sentence from Tatoeba

Note
Sentence from TatoebaBreakdown of denwasuruno o wasurete gomen nasai.
をo
direct object particle
電話するdenwasuru
to call, to telephone
忘れるwasureru
to forget
ごめん なさい。gomen nasai.
I beg your pardon; Excuse me.
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