Ons pomp die lekband by die fietsherstelwinkel op.

Because the verb here is the separable verb oppomp, meaning to pump up / inflate.

In a normal main clause in Afrikaans, the finite part of the verb goes near the beginning, and the separable particle goes to the end:

• Ons pomp ... op.

So pomp and op belong together.

You can think of it like this:

• dictionary form: oppomp
• main clause: Ons pomp die lekband ... op.

This is similar to English pump up, where up can also get separated:

• We pump up the tire
• We pump the tire up

In Afrikaans, separating it is the normal pattern in main clauses.

Lekband is a compound noun:

• lek = leak
• band = tire / tyre

So lekband literally means leak-tire, and in normal English this is usually flat tire or punctured tire.

Afrikaans very often builds nouns this way by joining smaller words into one compound.

Because Afrikaans verbs usually do not change form for different subjects in the present tense.

So:

• ek pomp = I pump
• jy pomp = you pump
• ons pomp = we pump
• hulle pomp = they pump

This is much simpler than English, which still has forms like I pump but he pumps. In Afrikaans, you normally just use the same verb form.

Here by means at.

So by die fietsherstelwinkel means at the bicycle repair shop.

Afrikaans often uses by for being at a person’s place, business, or location:

• by die dokter = at the doctor’s
• by die winkel = at the shop
• by my vriend = at my friend’s place

So in this sentence, it marks the location where the action happens.

Because die is the Afrikaans definite article for basically all nouns.

Unlike languages that have different forms for masculine, feminine, or neuter nouns, Afrikaans generally just uses:

• die = the

So:

• die lekband = the flat tire
• die fietsherstelwinkel = the bicycle repair shop

That makes articles in Afrikaans much easier than in many other European languages.

It is a long compound noun made from smaller parts:

• fiets = bicycle
• herstel = repair
• winkel = shop/store

So fietsherstelwinkel literally means bicycle-repair-shop.

A useful rule in Afrikaans is that the last part usually tells you what kind of thing it is. Here the last part is winkel, so the whole word is a kind of shop.

The sentence follows normal Afrikaans main-clause word order:

• Ons = subject
• pomp = finite verb
• die lekband = object
• by die fietsherstelwinkel = place expression
• op = separable particle

So the pattern is roughly:

Subject + finite verb + object + other information + separable particle

Afrikaans is a verb-second language in main clauses, which means the finite verb usually comes early in the sentence, typically in the second position.

Yes. Afrikaans allows some flexibility, especially with time and place phrases.

For example, you could also say:

• By die fietsherstelwinkel pomp ons die lekband op.

That puts emphasis on the location.

You may also hear:

• Ons pomp die lekband op by die fietsherstelwinkel.

That is also understandable and natural in many contexts.

The original sentence is a very normal neutral order, but Afrikaans can move parts around for emphasis or flow.

Yes. In Afrikaans, band can mean tire/tyre.

So:

• motorband = car tire
• fietsband = bicycle tire
• lekband = flat/punctured tire

This sometimes surprises English speakers, because English band usually means something different. But in Afrikaans, band is a normal tire word.

The dictionary form is oppomp.

When used with to-type wording, Afrikaans often separates it around te:

• om die lekband op te pomp = to pump up the flat tire

So you may see:

• main clause: Ons pomp die lekband op
• infinitive-style form: op te pomp
• dictionary form: oppomp

This is a very common pattern with separable verbs in Afrikaans.

It is singular.

You can tell because it refers to the flat tire as one item, and the form is lekband.

The plural would normally be:

• lekbande = flat tires

So:

• die lekband = the flat tire
• die lekbande = the flat tires