Not always.
Here is one where there is no need:
At least he was happy.
Here is one using a comma:
She knew at least, that she would make it home.
Comma's are the hardest punctuation mark to place in a sentence. A comma can be placed after instead at the beginning of a sentence if the sentence is a continuation of the subject in the one before it.
A comma splice and a fused sentence are essentially the same thing: they are both incorrectly punctuating two independent clauses if not two sentences. An example of a comma splice would be: I need to do my homework, the assignment is due tomorrow. The reason this is a comma splice is because the comma is too "weak" to hold the two independent clauses together. You can correct the sentence in the following ways: I need to do my homework; the assignment is due tomorrow. I need to do my homework, and the assignment is due tomorrow. I need to do my homework. The assignment is do tomorrow. I need to do my homework because the assignment is due tomorrow. Fixing comma splices really depends on what it is that you are trying to say, but the constant factor is that there is a comma being used to separate two independent clauses, and a comma can never do that. The difference between a comma splice and a fused sentence is that while a comma splice uses a comma incorrectly to separate two independent clauses, fused sentences don't use any punctuation, and so the sentence literally becomes "fused". Take the previous example: I need to do my homework the assignment is due tomorrow. If you are still having trouble understanding comma splices and fused sentences, try looking up and studying the following terms: -Dependent Clause -Independent Clause -Coordinating Conjunction -Subordinating Conjunction -How to use a semi-colon -When to use a comma
There might be a situation in which you would use a comma before a parenthesis, but generally you do not do this. A pair of parentheses already sets its contents apart from the rest of a sentence, so there is no need for a comma to precede the left parenthesis.
A compound sentence ir normally separated by the word "and" or "because", and a comma. If you can break the sentence in to 2 different parts and they are both complete sentences (meaning they both have a subject and an action) then it is a compound sentence. To put it more simply, a compound sentence is 2 complete sentences combined in to one whole sentence, separated by a comma.
You can mark the end of a sentence with an exclamation mark (!), a full stop (.), a question mark (?), or even three dots to signify an unfinished sentence (...), never a comma! So the answer is no.
No
No, a comma is not necessary after "perhaps" when it is at the beginning of a sentence unless it is followed by a contrasting idea.
No.
A comma is not necessary after "as well as" if it is being used to introduce more items in a list. However, if the phrase "as well as" is used to provide additional information in a sentence, a comma may be needed before and after it to set off that phrase.
Yes, a comma is necessary when a proper name is followed by additional information like a title or description. For example, in the sentence "John Smith, the CEO of the company, will be speaking at the event," a comma is used after "John Smith" to separate it from "the CEO of the company."
To seperate the words in a sentence.
"In five years, things happened." Yes you do need a comma.
Yes, there should be a comma after the word "because" in the sentence "Walking is often prescribed for seniors because it is less stressful on their joints" to separate the dependent clause "because it is less stressful on their joints" from the independent clause "Walking is often prescribed for seniors."
Yes, a comma is needed in the sentence. The correct way to write it would be "Yale is in New Haven, Connecticut." The comma is used to separate the city (New Haven) from the state (Connecticut) in the sentence.
No.
No.
Not necessarily. The comma indicates a pause in speech. Use a comma after "but" only to indicate a noticeable pause in speech. If there is no pause, there should be no comma.