A. A Conjunction is a word used to connect words, phrases, clauses, sentences or to coordinate words in the same (e.g. and, but, if, while, or although. etc.).
A1. The Conjunction type: coordinating conjunction, subordinating conjunction, and correlative conjunction.
a. Coordinating conjunction is to join words, phrases, and clauses together (e.g. and, but, or, nor, so, then, yet, etc.)
b. Subordinating conjunction is used in linking two clauses together (e.g. while, as soon as, although, before, even if, because, etc.)
c. Correlative conjunction is used to join equal sentence elements together. (e.g. either ~ or, not only ~ but also ~, whether ~ or, so ~ as, etc.)
A2. A compound sentence has two or more clauses, and they are joined by conjunctions. (e.g. They are coming by car so they should be here soon.)
a. A complex sentence has a main clause and one or more adverbial clauses. Adverbial clauses usually come after the main clause. (e.g. Her father died when she was very young. She had a difficult childhood because her father died when she was very young.)
b. Some subordinate clauses can come in front of the main clause. (e.g. Although a few snakes are dangerous most of them are quite harmless)
c. A sentence can contain both subordinate and coordinate clauses. (e.g. Although she has always lived in France, she speaks fluent English because her mother was American and her father was Nigerian.)