Question

how to use commas
compound sentences
a before the conjunction that joins the two main clauses of a compound
le i liked the story we read last week but i enjoyed \the meeting\ more.
not necessary when the main clauses are very short and are joined by the
conjunctions and, but, so, or, nor
ple some parts were confusing so i read the story again.
does separate short clauses joined by yet or for
ple this story is thrilling, for it involves the supernatural
which of the following sentences is punctuated correctly?
i want to go to sleep, but i know i need to work right now.
i want to go to sleep; but i know i need to work right now.
i want to go to sleep but i know i need to work right now.

Explanation:

According to the rules of comma usage in compound sentences, when joining two main clauses with a conjunction like "but", a comma is used before the conjunction. The second option uses a semicolon incorrectly (semicolons are for joining independent clauses without a conjunction or in specific list - like situations). The third option omits the comma, which is wrong as per the compound - sentence comma rule.

Answer:

I want to go to sleep, but I know I need to work right now.