The correct form for writing "P.S." is to use all uppercase letters with periods after each letter, like so: P.S. It stands for "postscript" and is typically used to add a note after the main body of a letter or email.
Both "I will do" and "I'll do" are correct. "I will do" is the full form, while "I'll do" is the contracted form. Contracted forms are commonly used in everyday speech and writing for the sake of convenience and brevity.
The correct usage would be "whom you are" in formal writing, as "whom" is the objective form of the pronoun "who." In casual conversation, "who you are" is more commonly used.
The plural possessive of "p and q" is "p's and q's" or "p and q's."
The correct comparative form of "simple" is "simpler" and the correct superlative form is "simplest."
"I'll" is the contracted form of "I will." Both are correct, but "I'll" is more commonly used in everyday speech or informal writing.
I BELIEVE THE CORRECT FORM WOULD BE: DEAR DR. AND MRS .....
could you send certified ps form 3800 and ps form 3811 mail to me
It is what you will hear in informal speech, but is not correct for formal writing. Try: "That is the girl.", "That is the woman.", "That is my sister.", "That is my wife.", etc. The grammatically correct form of the sentence 'That is her' is 'That is she.'
It should be capitalized.
The plural possessive of "p and q" is "p's and q's" or "p and q's."
P.S. stands for "Post Script."
Personal secretary?
30 PS
Correct writing: 23994Pu (but is recommended to use an equation editor).
Clearly you aren't writing in English to correct you, so I don't see why I should wright in English to correct me.
PS stands for postscript, and there are no periods after the P and S. It is an addition to a letter that is added after the main body and signature.
In an epistle/letter PS means 'Post Scriptum'. 'Post Scriptum' is Latin for 'after writing'.