Why does the English language need phrase AND clauses?
Because phrases add extra description and are never complete sentences. While on the other hand, clauses can be complete sentences, and also add description to sentences.
We need them both because they have different uses in our language. Semicolons are used to form a bond between two statements. Colons are used to separate a complete sentence and words that clarify the sentence.
Why do we need to have semicolons AND colons?
Dependant clauses are 'dependent' on independent clauses because they have to be attached to an independent clause; they are not complete sentences on their own.
A subordinating conjunction begins a dependent clause.
What's the point of a subordinating conjunction?
I think I'll look at one more car before I leave.
No, I want to look at what is out here first before it begins to rain.
I am just going to look at this car very quickly since it looks like it might rain. Then I am going to leave.
After we finish in here, I will show you our best selling car of the year.
Before you do that, let me show you what we have inside.
You use a semicolon if you have two independent clauses. For example: The man should have left the store before it began to rain; now he is stuck walking in the rain.
You use a colon after a statement that is a complete sentence, and before a group of words that explains the sentence. For example: The man did the following activities: left his home, walked to the bus stop, rode the bus to the store, and walked home.