A possible concise summary is:
The speaker is a teacher who explains what subordinate clauses adjectives are, how they can be classified into restrictive and explanatory, and how they can be reduced by using verbs in gerund, participle or infinitive forms. The speaker also gives examples, tips and exercises to help the students understand the topic. The speaker also promotes their writing and grammar platform and invites the students to follow them on Instagram.
Here are the key facts extracted from the text:
1. The speaker is discussing subordinate clauses, specifically adjective clauses.
2. There are two types of subordinate clauses: restrictive and explanatory.
3. Subordinate clauses always refer to a noun or pronoun in the main clause.
4. Subordinate clauses perform the function of an adnominal adjunct.
5. Restrictive subordinate clauses restrict the meaning of the noun or pronoun to a specific group.
6. Explanatory subordinate clauses explain something about the noun or pronoun.
7. The use of the comma can change the meaning of a sentence, especially with subordinate clauses.
8. Subordinate clauses can be reduced, meaning they don't have a relative pronoun and instead use a verb or infinitive, gerund, or participle.
9. The speaker provides examples of reduced subordinate clauses, such as "walking in the park" instead of "who were walking in the park".
10. The speaker encourages listeners to sign up for their class and study plan, which includes courses on writing, grammar, and literature.
11. The speaker has a platform for writing and grammar (com.br) and can be followed on Instagram for tips and updates.
12. The speaker will meet listeners in the next class.
Note: I excluded any opinions, interpretations, or analysis from the extracted facts, focusing only on the raw information presented in the text.