There are also adjectival and adverbial forms of develop.

develop也有形容词和副词形式。

You will learn about sentence patterns, adjectives, and adjectival prepositional phrases.

你将学、形容词和形容词介词短语。

Sometimes English speakers replace an adjective with a kind of phrase known as an adjectival prepositional phrase.

有时说英语的人会用形容词介词短语代替形容词。

You also gave an example of one common feature of adjectival infinitives—they often do not state the subject.

你还举例说明了形容词不定式的一个共同特征——它们通常不说主语。

And here is an adjectival use.

这是形容词用法。

So, phrases are groups of words that act like parts of speech, so this one, for example, is an adjectival or adverbial phrase.

所以，短语是一组词，就像词性一样，所以这个，例如，是一个形容词或副词短语。