Its Main cause; Subordinate Clause- Just got it right for apexx
They are only partially similar. A sentence is complete in itself, a clause - whether a main clause or a subordinate clause - may not be complete.
A simple sentence is an independent clause that is not joined to any other clause and stands by itself.
An Independent clause is independent or main clause expresses a complete thought and can stand by itself as a sentence. An Subordinate clause is a subordinate (or dependent) clause does not express a complete thought and cannot stand by itself as a complete sentence.
An insubordinate clause is just another word for an Independent clause. A subordinate clause is just another word for a Dependent clause. An Independent clause is a sentence that can stand by itself and a dependent clause can't stand by itself.
It's a clause that makes a complete sentence all by itself. So... Julie ran outside. "Julie ran outside" is an independent clause. Julie, who is my friend, ran outside. "Who is my friend" isn't a sentence by itself, so it's a dependent clause.
sentence fragment
A clause can only be part of a larger sentence. "Might is right" is a sentence by itself. With the verb "to be," the word "right" is a predicate adjective.
It's a clause that makes a complete sentence all by itself. So... Julie ran outside. "Julie ran outside" is an independent clause. Julie, who is my friend, ran outside. "Who is my friend" isn't a sentence by itself, so it's a dependent clause.
The independent clause in the sentence "When rain warms the ocean" is "rain warms the ocean." This clause can stand alone as a complete sentence because it contains a subject (rain) and a verb (warms).
The independent clause (the part that can stand by itself) is "he will not pass the course". The dependent clause (the sentence fragment) is "if he does not turn in his paper".
To fix a sentence fragment that is a subordinate clause, you can either combine it with an independent clause or rephrase it to form a complete sentence. Adding an independent clause will make it a dependent clause, allowing it to function as part of a complete sentence. Alternatively, you can revise the subordinate clause into an independent clause by providing any missing subject or verb it may have.