A sentence consists of two parts: the subject and the predicate.
The subject is the person or thing that acts or is described in the sentence.
The predicate, on the other hand, is the action or description.
A complete sentence needs both the subject and the predicate.
A sentence can be broken into clauses.
The boy is going to the school – and he is going to eat there.
This is a complete sentence composed of two clauses.
There are mainly two types of clauses: independent clauses and subordinate clauses.
Independent clauses act as complete sentences, while subordinate clauses cannot stand alone and need another clause to complete their meaning.
Independent clause: The boy went to the school.
Subordinate clause: After the boy went to the school…
A group of two or more grammatically linked words that do not have subject and predicate is a phrase.
The girl is at home – and tomorrow she is going to the amusement park.
You can see that “the amusement park” is a phrase located in the second clause of the complete sentence above.
A phrase acts like a part of speech inside a clause. That is, it can act as a noun, an adjective, an adverbs and so on.