Breakdown of watasi ha yonzyussai desu.
私watasi
I
ですdesu
to be
はha
topic particle
四十yonzyuu
40
〜歳〜sai
years of age (counter)
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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita
Hepburn romanizationwatashi wa chuugoku kara kimashita