Sisi tunajadiliana na marafiki.

Sisi means we. It is the independent subject pronoun.

In Sisi tunajadiliana na marafiki, it identifies who is doing the action: we.

Because Swahili often marks the subject in two ways:

• sisi = the separate pronoun we
• tu- = the subject marker inside the verb, also meaning we

So tunajadiliana already includes we. That means sisi is not strictly necessary for the grammar. It is often used for:

• emphasis
• contrast
• clarity

So both of these are correct:

• Sisi tunajadiliana na marafiki
• Tunajadiliana na marafiki

The version with sisi feels more like we, in particular...

A useful breakdown is:

• tu- = we
• -na- = present tense
• jadili = discuss
• -an- = reciprocal, meaning each other / one another
• -a = final vowel

So tunajadiliana means something like:

• we discuss with one another
• we are discussing together

-na- is the usual present-tense marker in Swahili.

Depending on context, it can correspond to English:

• we discuss
• we are discussing

So tunajadiliana can be understood as either a general present or an ongoing present. Context tells you which is intended.

-an- is a reciprocal extension. It adds the idea of people doing the action to each other or with one another.

That is important here:

• jadili = discuss
• jadiliana = discuss with each other, have a discussion together

So this sentence is not just about discussing a topic in a one-way sense. It suggests a two-way discussion or conversation.

Here, na means with.

So:

• na marafiki = with friends

That gives the full idea: we discuss with friends or we are discussing with friends.

Yes. Na can mean either and or with.

You tell the meaning from the context.

For example:

• Asha na Juma = Asha and Juma
• tunajadiliana na marafiki = we discuss with friends

In your sentence, it means with, not and.

Marafiki means friends.

The singular is rafiki, meaning friend.

So:

• rafiki = friend
• marafiki = friends

Swahili usually does not use articles the way English does.

So marafiki simply means friends, and context helps decide whether English would say:

• friends
• the friends
• some friends

If you want to say our friends, you would add a possessive:

• marafiki wetu = our friends

Yes. In fact, that is very common.

Because tu- inside tunajadiliana already means we, the shorter sentence is perfectly natural:

• Tunajadiliana na marafiki

You usually keep sisi only when you want extra emphasis or contrast.

Not quite.

• tunajadiliana na marafiki emphasizes a mutual discussion with friends
• tunajadili na marafiki sounds more like we discuss something with friends, and it often expects a topic

For example:

• Tunajadili suala hilo na marafiki = We discuss that issue with friends

So if no topic is mentioned, jadiliana is usually the better choice for the idea of discussing together.

The most neutral order is:

• Sisi tunajadiliana na marafiki

or, more commonly:

• Tunajadiliana na marafiki

Swahili word order is somewhat flexible, but beginners should usually keep this pattern:

subject + verb + other information

That will sound natural in most cases.