B2 (Upper Intermediate)Lesson 7: Normative Essentials
A set of pairs that sound identical, or nearly so, and are miswritten every day by learners and Brazilians alike. Each one gets a rule you can apply in a second: swap in bom or bem, ask whether meio is counting or hedging, check whether anything is moving, and decide between há and a by looking at which way the clock is pointing.
mau* is bom, mal is *bem: if bom fits the slot, write mau (um mau exemplo — a bad example); if bem fits, write mal (ele dirige mal — he drives badly).
meio agrees only when it means half: meia hora (half an hour) but ela está meio cansada (she is kind of tired) — the adverb never becomes meia.
meio-dia e meia (half past twelve) keeps the -a because it agrees with the hora nobody says out loud.
aonde only with movement: Onde você mora? (Where do you live?) but Aonde você vai? (Where are you going?); de onde for origin.
a fim de is desire or purpose (estou a fim de sair — I feel like going out); afim in one word means related (áreas afins — related fields).
senão = otherwise, se não = if not — if caso não fits, it is two words: Se não chover, a gente sai. (If it does not rain, we will go out.)
há looks backwards, daqui a looks forwards: há dois anos (two years ago) versus daqui a dois anos (two years from now).
mau ≈ bom (adjective) · mal ≈ bem (adverb) · meio = half agrees, meio = rather is invariable · aonde with movement · senão = otherwise · há = ago, daqui a = from now
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These are not exotic words: they are among the most frequent items in the language, which is exactly why getting them wrong is so visible. A meia cansada or an afim de in a cover letter, a message to a landlord or a university assignment tells the reader you write by ear rather than by rule. Two of the pairs also change meaning outright — senão and se não say opposite things about a condition, and há dois anos and daqui a dois anos point in opposite directions in time — so this is comprehension, not just tidiness.
mau is an adjective, the opposite of bom. It has a feminine (má) and a plural (maus, más), because adjectives agree. mal is an adverb, the opposite of bem, and it never changes shape.
That gives you a test you can run in half a second: put bom in the slot. If it fits, write mau. If bem fits instead, write mal.
Foi um mau começo. → Foi um bom começo. (It was a bad start. / It was a good start.) So: mau.
Ele dirige mal. → Ele dirige bem. (He drives badly. / He drives well.) So: mal.
Mal has two extra jobs worth recognising. As a noun it means evil or an ailment — o bem e o mal (good and evil), um mal necessário (a necessary evil). As a conjunction it means "hardly" or "as soon as": Mal cheguei, o telefone tocou. (I had barely arrived when the phone rang.) It is also the prefix in mal-humorado (bad-tempered) and mal-educado (rude).
| Portuguese | Meaning |
|---|---|
| Que mau humor hoje, hein! | What a bad mood today! |
| Ele passou mal depois do almoço. | He felt ill after lunch. |
| Comprei meia dúzia de ovos na feira. | I bought half a dozen eggs at the market. |
| O ônibus sai ao meio-dia e meia. | The bus leaves at half past twelve. |
| Estou meio perdido nesta rua. | I am a bit lost on this street. |
| Não sei de onde ele tirou essa ideia. | I do not know where he got that idea from. |
| Vim aqui a fim de resolver isso de uma vez. | I came here in order to sort this out once and for all. |
| Leva o guarda-chuva, senão você se molha. | Take the umbrella, otherwise you will get wet. |
Using mau for the adverb. ❌ Ele joga mau. → ✅ Ele joga mal. (He plays badly.) The bem test decides it: ele joga bem works, so the word is mal.
Making the hedging meio agree. ❌ Ela ficou meia nervosa. → ✅ Ela ficou meio nervosa. (She got a bit nervous.) Almost everyone says this one wrong out loud; write it right.
Using aonde for a static location. ❌ Aonde você mora? → ✅ Onde você mora? (Where do you live?) Nothing is moving, so nothing needs the a.
Doubling up on 'ago'. ❌ Há dois dias atrás. → ✅ Há dois dias. (Two days ago.) Há already means ago; atrás just repeats it.
Writing afim de. ❌ Estou afim de sair. → ✅ Estou a fim de sair. (I feel like going out.) The one-word afim only means related, as in matérias afins (related subjects).
Ending a sentence with porque. ❌ Ela saiu e ninguém sabe porque. → ✅ Ela saiu e ninguém sabe por quê. (She left and nobody knows why.) In final position the form is stressed, so it is two words with a circumflex.
Splitting senão when you mean 'otherwise'. ❌ Corre, se não você perde a hora. → ✅ Corre, senão você perde a hora. (Run, otherwise you will be late.) Two words only when caso não would fit.
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