The Core Idea
Regency is the preposition pattern a verb, noun, or adjective requires. Crase marks the fusion of a with another a, usually before a feminine noun phrase.
Regency errors and missing crases are classic high-visibility issues in formal Portuguese. A good mental map here pays off in writing, reading, and exams.
Structure Snapshot
- verb or noun + required preposition / a + a(s) = à(s)
Main Rules at a Glance
| Step | Rule |
|---|---|
| Rule 1 | Many verbs require a specific preposition: "gostar de", "precisar de", "obedecer a", "assistir a". |
| Rule 2 | Nouns and adjectives can also require prepositions: "medo de", "favorável a". |
| Rule 3 | Crase usually appears when a word requires "a" and the next feminine phrase also begins with "a": "vou à escola". |
| Rule 4 | No crase appears before masculine nouns, verbs, or most repeated words without the needed fusion. |
How It Works
- Many verbs require a specific preposition: "gostar de", "precisar de", "obedecer a", "assistir a".
- Nouns and adjectives can also require prepositions: "medo de", "favorável a".
- Crase usually appears when a word requires "a" and the next feminine phrase also begins with "a": "vou à escola".
- No crase appears before masculine nouns, verbs, or most repeated words without the needed fusion.
Usage and Register
- The biggest practical step is to learn regency together with the verb or noun from the start.
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