Practice

 

Fragments

 

"Not only... but also" can be used to connect either nouns or clauses. When it connects nouns, you never use commas, but when connecting clauses that are complete sentences, you use a comma to separate them. 

Connecting nouns: no comma

My favorite food is not only lobster but also scallops and shrimp.

Connecting clauses: use a comma

Not only will I eat lobster every chance I get, but I will also eat scallops and shrimp as often as I can.

Comma

https://wordvice.com/when-to-use-commas-colons-semicolons-and-dashes/

Semicolon

Semicolons join ideas that are related and equal in grammatical structure.

Even though the two clauses in the sentence above are related, we cannot use a semicolon there because the clauses are joined by the coordinating conjunction but. We can use either the semicolon there or the conjunction, but not both.

This assignment is extra credit only, but we still need to hand it in.

This assignment is extra credit only; however, we still need to hand it in.

John finished all his homework, but Kathleen did not finish hers.

John finished all his homework; Kathleen did not finish hers.

Semicolons should not be used between a dependent clause and an independent clause (although)

Semicolons with conjunctive adverbs and transitional expressions

Use a semicolon to replace a period between related sentences when the second sentence starts with either a conjunctive adverb or a transitional expression, such as for example, for instance, that is, besides, accordingly, furthermore, otherwise, however, thus, therefore.

Conjunctive Adverb:

Correct:

Kathleen worked for many hours on all her homework; nevertheless, she was unable to finish all of it.

Correct:

Harvey is a good driver; moreover, he is a friendly one.

https://www.niu.edu/writingtutorial/punctuation/semicolon.shtm

Printable:

 http://www.hagerstowncc.edu/sites/default/files/documents/Basic%20Rules%20for%20Commas%20and%20Semicolons.pdf