Coordinating conjunctions are these: FANBOYS (for, and, nor, but, or, yet, so).

Whenever you use one of these conjunctions to join independent clauses (that is, they could be independent sentences on their own), you need a comma after the first clause and before the conjunction.

If you use one of these conjunctions to join subjects, to join verbs, or other non-clause elements, do not use a comma.

http://grammar.ccc.commnet.edu/grammar/commas.htm
See use number 2 on this webpage.

Let us know how you put these together, and we'll give you feedback.

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Use coordinating conjunctionsjoin the following sentences.Use commas when need to. 1) The candiate pictured on the campaign poster seemed vaguely familar.I still can't figure out why.Can you help me with sentences like this.

To join the given sentences using coordinating conjunctions, we need to identify the independent clauses. In this case, the independent clauses are "The candidate pictured on the campaign poster seemed vaguely familiar" and "I still can't figure out why."

Since we are using coordinating conjunctions, we can choose the appropriate conjunction to join these clauses. In this case, the conjunction "but" would be suitable as it shows a contrast between the two clauses.

To combine the sentences using the conjunction "but" and include the necessary comma, we would write:

"The candidate pictured on the campaign poster seemed vaguely familiar, but I still can't figure out why."

In this sentence, we have included a comma after the first clause and before the coordinating conjunction "but" to follow the rules of using a comma before a coordinating conjunction when joining independent clauses.

By joining the sentences with a coordinating conjunction and utilizing proper comma usage, the final combined sentence is grammatically correct:

"The candidate pictured on the campaign poster seemed vaguely familiar, but I still can't figure out why."

If you have any other sentences or questions, feel free to ask!