yes you do in some cases
if the main or most important part is before the main parts you use a comma, but if it is after then no comma
Not necessarily. There is no word or phrase in English that requires a comma before or after it. Whether to use a comma is entirely a matter of sentence structure.
If I remember correctly you put it before, but my memory isn't quite what it used to be.... lol
after my breakfast
It depends. a) If the phrase following the whose cannot stand without it, then do not use comma. Ex, Joe Santos, who is my uncle, knows everyone in town. b) If the phrase following the whose can stand alone without it, then use comma. Ex, Students who do failing work will not pass.
Use "is" if the subject of the sentence is singular; use "are" if plural. "The fact that I ate after running *is* irrelevant. ("after running" is the prepositional phrase; "the fact" is the subject). The methods prisoners use to escape *are* manifold. ("to escape" is the prepositional phrase; "The methods" is the subject).
prepositional phrase
Use "I" when it is the subject of a verb. At all other times, use "me."
Say your sentence aloud. If you find you pause before the word 'therefore', you will probably want to insert a comma. If you do not pause, no comma is required. Use a comma when the sense requires it, not because you have a specific word in your sentence.
Not necessarily. There is no word or phrase in English that requires a comma.
It is not necessary to use a comma immediately following the word "hence." However, if the phrase following "hence" is a separate clause, then a comma may be used to separate the clauses.
Almost is an adverb.A phrase is more than one word so a prepositional phrase has two or three or more words.I saw the book under the table.In this sentence under the tableis a prepositional phrase.