請幫我改這幾句英文(好簡單的)

001 - The answers are wrong because an article(the) is missing.
On the first day of every year or 2009
On the first day of every month
On the first day of every week

Either Every or Each is OK.

每年，每個月及每個星期的第１日的英文應該係﹕

1. first day of each year
2. first day of each month
3. first day of each week

first, year, month, week 前面要有 “the”﹐即﹕

1. first day of the year
2. first day of the month
3. first day of the week

幾時後面要加ｓ?
day 同 (year, month, week) 都唔使加 s, 因為你係講僅 "first day" (即一日)﹐ 同 "the year (或 month, week)" 都係指該 一 年 (或月﹐日).