There are parts of a sentence that may or may not be meaningful. They are called phrases and clauses.
What is a phrase?
- A set of words that forms component of a clause.
- Acts as a single unit, hence not meaningful.
- No subject and predicate parts.
What is a clause?
- Group of words forming component of a sentence.
- Contains a subject and a predicate, hence meaningful.
- Pooja lives in Mysore, since 2012.
- I went to Surat, after returning from Delhi, last month.
In the first sentence, in Mysore is just a phrase, as it does not have a subject-verb pairing, while Pooja lives in Mysore is a clause, as it contains both subject and verb. In the next sentence, I went to Surat, is a clause because it has a subject and a verb, whereas to Surat and from Delhi, are the phrases, as it is just a group of words, not making any sense.