A phrase is a group of words that does not have a subject and verb. A clause, on the other hand, has a subject and verb.
In English, there are four basic kinds of phrases;
- gerund (always substantival),
- participle (always adjectival),
- infinitive (can be substantival, adjectival, or adverbial), and
- prepositional phrase (can be adjectival or adverbial).
The first three are also called verbals.