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両親に手紙を書く

write a letter to one's parents

→ 両親
phrase Rare #24,339
write a letter to one's parents 両親 means “parents,” に marks the recipient, 手紙 means “letter,” and 書く means “write.” The exact term appears in its dictionary form in the example sentence.
JA: 私は両親に手紙を書く。
EN: I write letters to my parents.

彼は必ず一度月に一回両親に手紙を書く。

He always writes to his parents once a month.

ジョンは月に一度両親に手紙を書く。

John writes a letter to his parents once a month.

彼は二ヶ月に一度、必ず両親に手紙を書くことにしている。

He makes sure to write to his parents once every two months.

彼は必ず月に一度両親に手紙を書く。

He always writes to his parents once a month.