Die gassilinder is buite die tent.

Because there are two definite nouns:

• die gassilinder = the gas cylinder
• die tent = the tent

In Afrikaans, die is the definite article for the, and it is used for both singular and plural nouns.

No. Afrikaans does not use different forms of the for grammatical gender.
So whether the noun is a person, object, or place, you still use die.

That is simpler than languages such as German or Dutch.

Gassilinder is a compound noun. Afrikaans often joins nouns into one word.

Here it is made from:

• gas
• silinder = cylinder

So gassilinder literally means gas cylinder.

Writing it as one word is normal in Afrikaans.

Because the compound joins gas + silinder. When those two parts come together, you get gassilinder.

This is a normal spelling result when one part ends in s and the next part begins with s.

Is is the present-tense form of to be, just like English is.

So:

• Die gassilinder is ... = The gas cylinder is ...

Afrikaans verbs are usually much simpler than English verbs, and is is used with both singular and plural subjects in the present tense.

Here buite means outside.

In this sentence, it works as a preposition introducing a location:

• buite die tent = outside the tent

So the sentence structure is:

• Die gassilinder = subject
• is = verb
• buite die tent = location

Because in Afrikaans, buite can directly take its object:

• buite die tent = outside the tent

You do not need an extra word like English of in outside of the tent.
Afrikaans normally keeps it simpler here.

Yes. This is the basic Afrikaans statement pattern:

• Subject + verb + rest

So:

• Die gassilinder = subject
• is = verb
• buite die tent = rest of the sentence

This is the most neutral and natural way to say it.

Yes, you could. That version puts more focus on the location:

• Buite die tent is die gassilinder.

It is grammatical, but the original sentence is the more basic, neutral order.

You would say:

Die gassilinder is nie buite die tent nie.

Afrikaans usually uses double nie in standard negation:

• first nie after the verb or early in the predicate
• second nie at the end of the clause

So the pattern is:

• is nie ... nie

You would say:

'n Gassilinder is buite die tent.

Here:

• 'n = a / an
• gassilinder = gas cylinder

Remember that 'n is written with a lowercase n, even at the beginning of a sentence in normal spelling. The next word is usually capitalized if needed by position.

A natural plural version would be:

Die gassilinders is buite die tent.
= The gas cylinders are outside the tent.

Notice two useful things:

• gassilinder becomes gassilinders
• is stays is

Afrikaans does not change is to a separate plural form like English are in the present tense.

A rough pronunciation guide is:

duh KHAS-sil-in-der is BOY-tuh duh tent

A few helpful notes:

• g in Afrikaans is usually a harsh throaty sound, not the English g in go
• buite sounds roughly like BOY-tuh
• die in Afrikaans is usually pronounced more like duh here, not like English die

The exact pronunciation can vary a little by accent, but that rough guide will help.

No. Afrikaans has very little case marking compared with some other Germanic languages.

That means you do not have to change die or the nouns because of their role in the sentence.
So die gassilinder and die tent keep the same simple form.