Na quinta-feira, meu tio vai me mandar um e-mail sobre o projeto da empresa.

Na is the contraction of em + a.

• em = in/on
• a = the feminine singular article the

So na quinta-feira literally works like on Thursday.

In Portuguese, days of the week often appear with an article:

• na segunda-feira
• na terça-feira
• na quarta-feira
• na quinta-feira

You may also hear just quinta-feira in some contexts, but na quinta-feira is very natural here.

The weekdays from Monday to Friday are normally written with a hyphen in standard Portuguese:

• segunda-feira
• terça-feira
• quarta-feira
• quinta-feira
• sexta-feira

This is just the standard spelling. Feira is part of the weekday name, so the hyphen stays.

In Portuguese, Monday through Friday are numbered:

• segunda-feira = second day
• terça-feira = third day
• quarta-feira = fourth day
• quinta-feira = fifth day
• sexta-feira = sixth day

So quinta-feira literally means fifth day/fair historically. For a learner, the important thing is simply that quinta-feira = Thursday.

Because Na quinta-feira is an introductory time expression placed at the beginning of the sentence.

So the comma helps separate:

• the time phrase: Na quinta-feira
• the main statement: meu tio vai me mandar...

In Portuguese, this comma is very common and natural. You may sometimes see sentences without it in informal writing, but with it, the sentence is clearer and more standard.

In Brazilian Portuguese, possessives can appear:

• with an article: o meu tio
• without an article: meu tio

Both are possible in many situations.

In Brazil, dropping the article is very common, especially in everyday speech:

• meu irmão
• minha mãe
• meu tio

So meu tio sounds completely normal.

This is the very common ir + infinitive future in Brazilian Portuguese:

• vai mandar = is going to send / will send

So:

• meu tio vai me mandar = my uncle is going to send me

Although mandará is grammatically correct, it sounds more formal, literary, or less common in everyday Brazilian speech.

Compare:

• Meu tio vai me mandar um e-mail. → very natural in conversation
• Meu tio me mandará um e-mail. → correct, but more formal

Me is the indirect object pronoun meaning to me.

So:

• mandar um e-mail = to send an email
• me mandar um e-mail = to send me an email

In English, we can say:

• send me an email
• send an email to me

Portuguese uses the pronoun me directly before the verb here.

In Brazilian Portuguese, vai me mandar is the most natural and common order.

Brazilian Portuguese strongly prefers placing object pronouns before the main verb in this kind of structure:

• vai me ligar
• vai te avisar
• vai nos ajudar

The form vai mandar-me is grammatically possible in more formal or European Portuguese styles, but it sounds unnatural in everyday Brazilian speech.

Yes, but it changes the structure a bit.

• meu tio vai me mandar um e-mail = the most natural way to say my uncle is going to send me an email
• meu tio vai mandar um e-mail para mim = also understandable, but it sounds a little less direct in this context

Usually, with verbs like mandar, dar, enviar, Portuguese often prefers the indirect object pronoun:

• me mandar
• me enviar
• me dar

So the original sentence is the most idiomatic choice.

Yes. In Brazilian Portuguese, e-mail is usually treated as masculine:

• um e-mail
• o e-mail
• do e-mail

That is the most common usage.

You may also hear email written without the hyphen, especially in less formal contexts, but e-mail is still widely recognized.

It is commonly pronounced something like ee-MÉU in Brazilian Portuguese, adapted to Portuguese sound patterns.

A learner should mainly recognize that Brazilians often pronounce English loanwords in a Portuguese way. So even though the word comes from English, it may not sound exactly like English email.

Both can mean to send.

• mandar is very common in everyday speech
• enviar is also correct, but can sound a little more formal or neutral depending on context

So these are both fine:

• Meu tio vai me mandar um e-mail.
• Meu tio vai me enviar um e-mail.

In casual Brazilian Portuguese, mandar is extremely common.

Sobre means about or regarding.

So:

• sobre o projeto = about the project

This is a very common preposition for topics:

• um livro sobre história = a book about history
• falar sobre política = to talk about politics
• um e-mail sobre o projeto = an email about the project

Because da is the contraction of de + a.

• de = of/from
• a = the

So:

• de a empresa becomes da empresa

This kind of contraction is very important in Portuguese:

• de + o = do
• de + a = da
• em + o = no
• em + a = na

So o projeto da empresa means the company’s project or the project of the company.

Usually, yes. O projeto da empresa most naturally means:

• the project of the company
• the company’s project
• the project that belongs to or is associated with the company

Portuguese often uses de to show this relationship:

• o carro do meu pai = my father’s car
• a casa da minha avó = my grandmother’s house
• o projeto da empresa = the company’s project

Yes. Portuguese allows some flexibility.

For example:

• Meu tio vai me mandar um e-mail sobre o projeto da empresa na quinta-feira.
• Na quinta-feira, meu tio vai me mandar um e-mail sobre o projeto da empresa.

Both are correct, but the emphasis changes a little.

• Starting with Na quinta-feira highlights when
• Putting it later makes the sentence begin more directly with who is doing the action

The original version is very natural if you want to foreground the time.

It is neutral and natural.

Nothing in it is slangy, but it is also not overly formal. It sounds like standard everyday Brazilian Portuguese.

A more formal version might use words like:

• enviar instead of mandar
• mandará instead of vai mandar

But the original sentence is perfectly good standard Portuguese.

Sometimes yes, but not in the same way English does it.

Portuguese often drops subject pronouns like eu, ele, nós when the context is clear. But meu tio is a noun phrase, not just a pronoun, so if you omit it, the listener needs to know who you mean.

For example, after already mentioning him, you might say:

• Na quinta-feira, vai me mandar um e-mail sobre o projeto da empresa.

But this works only if the subject is already obvious from context. Otherwise, keeping meu tio is much clearer.