Published on
June 3, 2025
by
Tom Challenger, BA.
Revised on
January 22, 2026
As well as means โand alsoโ or โin addition to.โ A comma before as well as is typically optional and not required in short sentences and clauses. You can use QuillBotโs free Grammar Checker to help you decide if a comma is necessary.
No comma before as well as examplesThis program includes business courses as well as French and German. [After a direct object]
They sent me a replacement as well as a $50 gift card. [After an indirect object]
She is an excellent violinist as well as a competent pianist. [Connecting noun phrases after a linking verb like โbeโ]
We can wax as well as wash your car. [Connecting verbs]
Adding an optional comma can help the reader by breaking up a longer sentence.
Comma before as well as in longer sentences exampleThis new program includes the foundational business courses from our business program, as well as the core French and German components of our existing French and German program.NoteYou donโt put a comma before as well as when youโre making a comparison (i.e., where โwellโ is the adverb form of โgoodโ).
Does he cook as well as you?
Does he cook, as well as you?
I canโt write German as well as I can speak it.
I canโt write German, as well as I can speak it.
Published on
July 1, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
Put a comma before but when itโs used to connect two independent clauses (i.e., two clauses that each contain a subject and a verb).
Example: Commas before but connecting two independent clausesJustinwanted to go to the party, but hewas busy.
Put a comma after but only when it is followed by an interrupter (i.e., a parenthetical expression that qualifies the statement or indicates mood or tone).
Example: Comma after but when using an interrupterBut, having realized his mistake, the doctor apologized.
Published on
July 1, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
A comma splice is a grammatical error that occurs when two independent clauses are incorrectly joined using a comma. A clause is independent if it contains a subject and a verb and expresses a complete thought.
You can correct a comma splice in the following ways:
Published on
July 1, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
A comma is used before the prepositional phrase “such as” when it introduces a nonrestrictive clause (additional information that’s not essential to the core meaning of a sentence). If the “such as” clause is essential to the meaning of the sentence, no comma is needed.
โSuch asโ introducing essential identifying information (no comma)
Many European languages, such as Italian and French, are descended from Latin.
Resources such as libraries and online databases are essential to student learning.
The shop sells a number of useful tools, such as hammers, shovels, and rakes.
Jonah enjoys activities such as hiking and swimming.
TipIf youโre unsure whether you need a comma, try removing the โsuch asโ phrase. If the sentence still conveys the same basic meaning, include a comma. If not, donโt include a comma:
โMany European languages are descended from Latinโ conveys the same meaning as the original sentence.
โJonah enjoys activitiesโ is vague and does not express the intended meaning. The โsuch asโ clause is essential, so no comma is needed.
Published on
July 1, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
There should be no comma before โbecauseโ when itโs used to introduce a reason that is essential to the meaning of the sentence.
For example, the point of the sentence below is to explain why the project failed.
Example: Because introducing essential informationThe project failed because the team lacked proper communication.
When a comma is added before โbecause,โ the reason is no longer emphasized. Instead, the sentence focuses on the fact the project failed; the reason it failed is less important.
Example: Comma before becauseThe project failed, because the team lacked proper communication.
Published on
June 28, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
You need a comma before the conjunction โsoโ when it could be replaced with โthereforeโ (i.e., โfor that reasonโ).
Example: Comma before so meaning โthereforeโI was tired, so I went to bed.
I was tired. Therefore, I went to bed.
Example: No comma before so meaning โso thatโTom left early so he could arrive at the office on time.
Tom left early so that he could arrive at the office on time.
When โsoโ is used as an adverb, pronoun, or other part of speech, commas are generally not needed (e.g., โI hope so,โ โhe stayed a week or so,โ โthereโs still so much to doโ).
Published on
June 28, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
The word โwhileโ can be used in a couple of different ways. Whether you should put a comma before โwhileโ depends on how youโre using the word.
You should put a comma before โwhileโ when youโre using it to link two parts of a sentence, with the same meaning as โwhereasโ or โalthough.โ
Example: โWhileโ meaning โalthoughโSome students enjoy working independently, while others prefer group projects.
You shouldnโt put a comma before โwhileโ when youโre using it to mean โwhenโ or โduring the time that.โ
Example: โWhileโ meaning โduring the time thatโJohn slept while Eva studied.
You should put commas before and after โtooโ when it comes between a verb and its object (i.e., a noun, noun phrase, or pronoun that is affected by the action of a verb).
Example: Comma before too
I hope too that youโll join us for the party.
I hope, too, that youโll join us for the party.
When โtooโ is used at the start of a sentence, it should also be followed by a comma (however, we advise against using โtooโ in this way).
Published on
June 27, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
The relative pronoun โwhichโ is used to introduce a relative or adjectival clause.
You should put a comma before โwhichโ when itโs used to introduce a nonrestrictive clauseโa clause that provides information that is not essential to the meaning of the sentence.
Examples: Comma before โwhichโ introducing a nonrestrictive clauseThe skyscraper, which was built in the 1930s, is being renovated.
She wore a beautiful necklace, which was a gift from her grandmother.
You donโt need a comma before โwhichโ when itโs used to introduce a restrictive clauseโa clause that provides essential information, without which the sentence wouldnโt make sense or would mean something else.
Examples: โWhichโ introducing a restrictive clauseThe cat which lives next door is very friendly.
The book which Iโm reading is a bestseller.
TipIf youโre unsure whether a comma is needed before โwhich,โ try omitting the โwhichโ clause from the sentence:
If the basic meaning of the sentence doesnโt change, a comma is required (e.g., โThe skyscraper is being renovatedโ).
If the meaning of the sentence is unclear or less specific, no comma is needed (e.g., โThe cat is very friendlyโ; what cat?).
Published on
June 27, 2024
by
Eoghan Ryan, MA.
Revised on
November 3, 2025
Put a comma before โorโ when itโs used to connect two independent clauses. A clause is independent if it contains a subject and verb and expresses a complete thought.
Comma before โorโ connecting two independent clauses exampleWe might get a late train home, or we might spend the night in the city.
However, when โorโ connects two verbs with one subject, it should not be preceded by a comma.
โOrโ connecting two verbs with one subject exampleYou can either borrow my bike or walk.
