La soldato portas tornistron.

La is the definite article, meaning the.

So:

• la soldato = the soldier
• soldato = a soldier or just soldier in a general sense, depending on context

Esperanto has only one article, la, and it does not change for gender, number, or case.

The ending -o marks a noun in Esperanto.

So:

• soldat- = the word root related to soldier
• soldato = soldier

This is a very important Esperanto pattern:

• -o = noun
• -a = adjective
• -e = adverb
• -i = infinitive verb

The ending -as marks the present tense in Esperanto.

So portas means carry/carries, am carrying/is carrying/are carrying, depending on context.

Esperanto present tense does not force the same distinction English does between:

• carries
• is carrying

Both can be expressed by portas.

The basic dictionary form is porti, meaning to carry or to wear in some contexts.

The parts are:

• port- = carry
• -i = infinitive
• -as = present tense

So:

• porti = to carry
• portas = carries / is carrying

The -n ending marks the direct object.

In this sentence, the soldier is doing the action of carrying, and the thing being carried is the backpack/knapsack. So tornistron is the direct object.

Compare:

• La soldato portas tornistron. = The soldier carries a knapsack.
• La soldato is the subject
• tornistron is the object

The -n ending is one of the most important parts of Esperanto grammar.

Because the sentence does not necessarily mean the knapsack. Without la, tornistron usually means a knapsack or simply knapsack as an object.

So:

• portas tornistron = carries a knapsack
• portas la tornistron = carries the knapsack

Whether English uses a or no article in translation depends on context, but Esperanto itself is being clear: there is no la here.

Yes, to some extent.

Because tornistron has the object marker -n, Esperanto word order is more flexible than English word order.

For example, these mean basically the same thing:

• La soldato portas tornistron.
• Tornistron portas la soldato.

The first is the most neutral and natural for beginners: subject + verb + object.

You look at the sentence structure and endings.

Here:

• La soldato has no -n, so it is the subject
• tornistron has -n, so it is the direct object

That tells you that the soldier is doing the carrying, and the knapsack is what is being carried.

No. By itself, soldato means soldier and is not inherently male in ordinary Esperanto usage.

If you specifically want to mark female, Esperanto often uses -ino for female forms:

• soldato = soldier
• soldatino = female soldier

But in many contexts, soldato can refer to any soldier unless sex is relevant.

A simple approximate pronunciation is:

lah sol-DAH-toh POR-tahs tor-nee-STRON

A few helpful points:

• a sounds like ah
• o sounds like oh
• i sounds like ee
• stress usually falls on the second-to-last syllable

So:

• soldato → sol-DA-to
• portas → POR-tas
• tornistron → tor-ni-STRON

A tornistro is a knapsack, backpack, or soldier’s pack.

In older or more military contexts, knapsack is often the best translation. In modern general understanding, learners may think of it as a kind of backpack.

So:

• tornistro = knapsack / backpack
• tornistron = knapsack / backpack as a direct object

In Esperanto, verbs do not change according to person or number.

So the present tense is always -as:

• mi portas = I carry
• vi portas = you carry
• li portas = he carries
• la soldato portas = the soldier carries
• ili portas = they carry

This is much simpler than English, where we say I carry but he carries.

Yes. Plural nouns take -j.

So:

• la soldato = the soldier
• la soldatoj = the soldiers
• tornistro = knapsack
• tornistroj = knapsacks

If a plural noun is also a direct object, it takes both endings:

• tornistrojn = knapsacks (as direct object)

Example:

• La soldatoj portas tornistrojn. = The soldiers carry knapsacks.