Gharama za usafiri ni kubwa.

Za links two nouns. In this sentence, it means something like of or for.

So gharama za usafiri = costs of transport/travel or transport costs.

This kind of connector changes form to match the noun before it.

Because gharama can be understood as either singular or plural, and the connector helps show which one you mean.

• gharama ya usafiri = the cost of transport / transport cost
• gharama za usafiri = transport costs / the costs of transport

So za here suggests a plural or more general costs idea.

Some Swahili nouns look the same in both singular and plural. Gharama is one of them.

That means you often tell the number from:

• the words agreeing with it, such as ya vs za
• the context

So even though gharama stays the same, za helps show that the phrase is plural/generic here.

Usafiri means travel, transport, or transportation in a general sense.

It comes from the verb -safiri, meaning to travel.

In this sentence, usafiri is not one specific trip. It means travel/transport in general, such as the activity or system of getting from one place to another.

Ni is the copula, the word used for is / are / am.

So:

• Gharama za usafiri ni kubwa = Transport costs are high

A useful thing to know is that ni does not change for singular or plural.

• Mtoto ni mkubwa = The child is big
• Watoto ni wakubwa = The children are big

In both cases, the copula is still ni.

Yes, kubwa literally means big or large, but Swahili often uses it more broadly.

With things like:

• costs
• problems
• differences
• importance

kubwa can mean great, large, or high.

So gharama ni kubwa is a natural way to say the cost is high.

You can use ghali, but it changes the focus slightly.

• Usafiri ni ghali = Transport is expensive
• Gharama za usafiri ni kubwa = Transport costs are high

So:

• ghali describes something as expensive
• kubwa describes the cost/amount as high/large

Both are possible in the right context, but kubwa fits very naturally with gharama.

It actually is the correct agreement form for this noun class.

Swahili adjectives usually agree with the noun, but sometimes the form looks unchanged on the surface. With nouns like gharama, the adjective -kubwa appears as kubwa.

Compare:

• mtoto mkubwa = big child
• watoto wakubwa = big children
• gharama kubwa = big/high cost
• gharama kubwa = big/high costs

So the agreement is there, but the form happens to stay kubwa.

You would normally say:

Gharama ya usafiri ni kubwa.

The only change is:

• ya for singular
• za for plural/generic costs

So:

• Gharama ya usafiri ni kubwa = The transport cost is high
• Gharama za usafiri ni kubwa = Transport costs are high

Not exactly.

• usafiri = travel/transportation in general
• safari = journey, trip, or travel as a trip/event

So in this sentence, usafiri is better because the sentence is about the general cost of transport, not one particular journey.

Usually, the natural order is:

subject phrase + ni + description

So: Gharama za usafiri ni kubwa

Also, gharama za usafiri stays together as one noun phrase. You should not split it up.

A learner-friendly way to see the structure is:

• Gharama za usafiri = the subject
• ni = is/are
• kubwa = high/large