Ons pomp die lekband op en toets die weerkaatser.

Yes — this is a separable verb.

The full verb is oppomp, meaning to pump up / inflate. In a main clause, Afrikaans often splits this kind of verb:

• Ons pomp die lekband op.
• literally: We pump the flat tire up

So:

• pomp = the verb part that gets placed in the normal verb position
• op = the separable particle, which moves toward the end of the clause

This is very similar to English pump up.

Compare:

• Ek pomp die band op. = I pump the tire up.
• Ons wil die band oppomp. = We want to pump up the tire.

In the second example, after another verb like wil, the separable verb usually stays together as oppomp.

No. In Afrikaans, verbs usually do not change according to the subject in the present tense.

So you get:

• Ek pomp = I pump
• Jy pomp = you pump
• Ons pomp = we pump
• Hulle pomp = they pump

The same is true for toets:

• Ek toets
• Ons toets
• Hulle toets

This is much simpler than English, where you have a change like I test but he tests.

Lekband is a compound noun:

• lek = leak / puncture
• band = tire / tyre

So lekband means something like:

• flat tire
• punctured tire
• sometimes leaking tire

In context, it refers to a tire that has gone flat and now needs air.

Afrikaans uses compounds very freely, so words that English might write as two words are often written as one word.

Because die is the normal definite article in Afrikaans, meaning the.

A very useful thing for learners is that die does not change for gender the way articles do in some other languages. It is used for:

• singular nouns
• plural nouns
• all genders

So:

• die band = the tire
• die weerkaatser = the reflector
• die bande = the tires

That makes Afrikaans articles much simpler than, for example, German or Dutch.

Weerkaatser means reflector.

It comes from the idea of reflecting light:

• weerkaats = reflect / bounce back
• -er / -ser ending here forms a noun meaning something that does the action

So weerkaatser is literally something like a thing that reflects.

This is often used for a bicycle reflector, road reflector, or similar safety device.

Because the same subject applies to both verbs:

• Ons pomp die lekband op
• en toets die weerkaatser

This means:

• We pump up the flat tire
• and test the reflector

Afrikaans often leaves out the repeated subject when it is clearly the same.

You could repeat it, but it would usually sound unnecessary:

• Ons pomp die lekband op en ons toets die weerkaatser.

That is grammatical, but less natural unless you want extra emphasis.

Because en simply joins two equal parts of the sentence.

In this sentence, you really have two coordinated main-clause verb phrases:

• Ons pomp die lekband op
• (ons) toets die weerkaatser

After en, the second verb phrase keeps normal main-clause order. Afrikaans does not move toets to the end here.

So the structure is:

• Ons = subject
• pomp ... op = first verb phrase
• en
• toets ... = second verb phrase

Not always. Ons can mean:

• we when it is the subject
• us when it is the object

In this sentence, ons is the subject, so it means we:

• Ons pomp ... = We pump ...

Compare:

• Hulle sien ons. = They see us.

So the meaning depends on the role it plays in the sentence.

Because Afrikaans usually uses the basic verb form for the present tense.

So:

• Ons pomp = we pump / we are pumping
• Ons toets = we test / we are testing

Afrikaans often lets context decide whether English would use:

• the simple present (we pump) or
• the present continuous (we are pumping)

In everyday usage, the plain verb form often covers both ideas.

Not always. Band can have several meanings depending on context, including:

• tire / tyre
• belt
• band in some other senses

But in lekband, the meaning is clearly tire because lekband is a common expression for a flat or punctured tire.

So learners should get used to the idea that Afrikaans words, like English words, can have multiple meanings depending on context.

Yes. That would also be grammatical.

It would just change the order of the actions:

• Ons pomp die lekband op en toets die weerkaatser.
• Ons toets die weerkaatser en pomp die lekband op.

Both are fine. The original sentence suggests that pumping up the flat tire is mentioned first, and testing the reflector second.

So the difference is mainly about emphasis or sequence, not grammar.

No. Op is a very common particle in Afrikaans and appears in many separable verbs.

With pomp, oppomp means pump up / inflate.

But op can also appear with many other verbs, for example:

• eet op = eat up / finish eating
• maak op = make up / use up / apply, depending on context
• tel op = pick up

So in this sentence, op is not a separate preposition meaning on. It is part of the separable verb oppomp.

Very often, yes.

Afrikaans strongly prefers writing compound nouns as one word, where English might use two words or a hyphen.

Examples:

• lekband = flat tire
• fietslig = bicycle light
• motorfietshelm = motorcycle helmet

This is something English speakers often need to get used to. If two words together form one noun idea, Afrikaans will often join them into a single written word.