英文don't didn't問題

How do/did/will you celebrate your birthday?
你(都怎麼/是怎麼/將怎摸)慶祝你的生日(的)?

I don't celebrate my birthday(s). <--- 表示一個原則, 一向都如此.

I didn't celebrate my birthday. <--- 生日已過的說法(單次).

I won't celebrate my birthday. <--- 生日還沒到的說法(單次)

不可以寫 I don't celebrate birthday. / I didn't celebrate birthday.

可以寫成
I don't celebrate birthdays. 任何的生日我都不慶祝。
I don't celebrate my birthdays. 我不慶祝自己的生日。
用present tense "don't" 就是表示習慣/一貫的做法, 無論過去,現在,未來你都會這樣做

I didn't celebrate my birthday. 我那天沒慶祝。
I didn't celebrate the birthday. 我那天沒慶祝。
用past tense "didn't" 就是表示過去發生的事
(而且birthday 是singular, 不像"my birthdays", 所以有 "那一個生日"的意思)