yes
It is correct to write "Children's Day celebrations" because "Children's" is the possessive form indicating that the day belongs to the children.
Boss's day is the correct way to write it.
Yes, it is correct to write "Please reply by today" to indicate that you are requesting a response by the end of the day.
Valentine should be capitalised, because it's a name (St Valentine).Valentine's Day is the correct way to write it. Alternatively you can write Saint Valentine's Day, but that is not as popular as the shortened version.For example:"To my dearest wife, happy Valentine's Day""I like you, can I take you for a meal on Valentine's Day?"
Since I was born that day and told it was a Monday
10 May '10 is correct. The apostrophe before the 10 shows the omission of the 20 in the year 2010. In this date format, the day of the month comes first, then the month, then the year.
Not a correct shortened form of words. You should write/say 'It had'.
Since Joe Mama's real context is like saying your mother, Joe Mama was born on the day your mother was born.
It is correct to say "such an exhausting day", and not 'Such an exhaustive day'.
big write on every day is earth day
If this is in the United States you don't need to write a letter. At the very most a small note to the office telling them why or a doctors note will do the job. You can also call them since it was just one day.
Grammatically, Presidents' Day is NOT correct. The correct spelling should have no apostrophes at all as the day does not BELONG to the presidents, therefore it is not possessive.