A lei é importante.

Here, a is the feminine singular definite article, meaning the.

So a lei = the law.

In Portuguese, articles are used very often, including in general statements. That is why Portuguese says A lei é importante where English says The law is important.

Because Portuguese usually prefers an article before a noun when speaking about something specific or about a whole category in a general way.

So:

• A lei é importante = The law is important
• Lei é importante sounds less natural in most everyday contexts

Dropping the article is possible in some special cases, but for a basic general statement like this, a lei is the normal choice.

Lei is feminine, which is why it takes a, not o.

You normally learn the gender of each noun together with its article:

• a lei = the law
• not o lei

Unfortunately, noun gender is not always predictable from the ending. Even though many feminine nouns end in -a, lei is feminine even though it does not.

A good habit is to memorize nouns with their articles:

• a lei
• o livro
• a casa

É means is.

It comes from the verb ser, which is one of the main ways to say to be in Portuguese.

This is the he/she/it and you (formal) form of ser in the present tense:

• eu sou = I am
• você/ele/ela é = you are / he is / she is
• nós somos = we are
• eles/elas são = they are

So in A lei é importante, é links the subject a lei to the description importante.

The accent in é is important because it shows both spelling and pronunciation.

• é = is
• e = and

So the accent helps you distinguish two very common words:

• A lei é importante = The law is important
• A lei e importante would be incorrect

The accent also tells you that the vowel is pronounced clearly, like an open eh sound.

A simple approximation for an English speaker is:

• a → ah
• lei → like lay
• é → like eh
• importante → roughly eem-por-TAHN-chee in Brazilian Portuguese

A more helpful breakdown:

• A lei → ah LAY
• é → EH
• importante → im-por-TAHN-chee

A few pronunciation notes for Brazilian Portuguese:

• lei rhymes closely with English say, but with a cleaner vowel
• é is a short open vowel
• the final te in importante often sounds like chee in many Brazilian accents

So the whole sentence sounds approximately like:

ah LAY EH im-por-TAHN-chee

Because importante is an adjective with the same form for both masculine and feminine singular.

So you get:

• o livro importante = the important book
• a lei importante = the important law

But it does change in the plural:

• o livro importante
• os livros importantes
• a lei importante
• as leis importantes

So importante does agree in number, but not in gender in the singular form.

Normally, no. In this sentence, é is the correct choice.

Portuguese has two main verbs for to be:

• ser for more essential, defining, or general characteristics
• estar for temporary states or conditions

Since important here is a general quality of the law, Portuguese uses ser:

• A lei é importante

Using estar would sound unusual unless you were talking about a temporary situation in a special context.

Yes, but the basic and most natural order is:

• A lei é importante

That is the standard subject + verb + adjective pattern.

You might also hear something like:

• Importante é a lei

But that sounds marked or emphatic, as if highlighting what is important is the law. It is not the neutral version a learner should use first.

So for normal use, stick with:

• A lei é importante

You would change the article, noun, verb, and adjective as needed:

• As leis são importantes = The laws are important

Breakdown:

• a → as
• lei → leis
• é → são
• importante → importantes

This is a good example of agreement in Portuguese.

It can often be understood as a general statement, depending on context.

Portuguese commonly uses the definite article with a singular noun to talk about something in a broad, general sense:

• A lei é importante can mean Law is important or The law is important

If the context is about one particular law, it can also mean that specific law is important.

So the exact interpretation depends on the situation, but grammatically the sentence works well for a general statement.

Grammatically, yes. The structure stays the same:

• A regra é importante = The rule is important

But lei and regra are not the same thing:

• lei = law
• regra = rule

So the grammar pattern is useful:

• A + noun + é + adjective

Examples:

• A casa é grande
• A música é bonita
• A lei é importante

This makes A lei é importante a very good model sentence for beginners.