Ons sal sekerlik terugkeer.

Yes. Ons is the normal Afrikaans subject pronoun for we.

• Ons = we
• It is also used for us in object position in everyday Afrikaans.

Examples:

• Ons kom môre. = We are coming tomorrow.
• Hy sien ons. = He sees us.

So unlike English, Afrikaans often uses the same form for both we and us.

Sal is the usual auxiliary verb used to form the future tense in Afrikaans.

So:

• Ons keer terug. = We return / We are returning
• Ons sal terugkeer. = We will return

A useful pattern is:

• subject + sal + main verb

Examples:

• Ek sal gaan. = I will go.
• Hulle sal wag. = They will wait.

In your sentence, sal tells you that the action is in the future.

Because in a main clause with a future auxiliary like sal, Afrikaans usually puts the main verb at the end.

Pattern:

• Ons
  • sal
    • sekerlik
      • terugkeer

This is very common in Afrikaans:

• Ek sal môre werk. = I will work tomorrow.
• Sy sal dit onthou. = She will remember it.

For English speakers, this can feel a bit like German or Dutch word order. The helping verb comes earlier, and the main verb often goes to the end.

Sekerlik means certainly, surely, or definitely, depending on context.

In this sentence it adds confidence or certainty:

• Ons sal terugkeer. = We will return.
• Ons sal sekerlik terugkeer. = We will certainly / definitely return.

It makes the statement stronger.

Be careful not to confuse it with a word that means probably. Sekerlik expresses confidence, not uncertainty.

They often go after the auxiliary verb and before the main verb, as in this sentence:

• Ons sal sekerlik terugkeer.

That is a very natural position.

You may also see adverbs moved for emphasis, but the neutral order here is very normal:

• subject + auxiliary + adverb + main verb

Examples:

• Hy sal waarskynlik kom. = He will probably come.
• Ek sal beslis help. = I will definitely help.

So sekerlik is in a very standard spot.

Yes, terugkeer is normally written as one word.

It is made up of:

• terug = back
• keer = turn / return

Together, terugkeer means return or come back.

You can think of it as a single verb meaning to return.

Examples:

• Hulle keer terug. = They return / They come back.
• Wanneer sal julle terugkeer? = When will you return?

Absolutely. That would still be correct.

• Ons sal terugkeer. = We will return.
• Ons sal sekerlik terugkeer. = We will certainly return.

The version without sekerlik is simpler and more neutral. Adding sekerlik gives extra emphasis and certainty.

Yes, there is a small difference.

• terugkeer is often a bit more formal or literary.
• terugkom is more everyday and conversational.

So:

• Ons sal terugkeer. sounds slightly more formal or elevated.
• Ons sal terugkom. sounds very natural in everyday speech.

Both can mean we will return, but the tone is a little different.

It sounds perfectly natural, though slightly formal because of terugkeer and sekerlik together.

In everyday speech, many speakers might say:

• Ons sal beslis terugkom.
• Ons sal weer terugkom.
• Ons kom beslis terug.

Your original sentence is correct, but it has a slightly more careful or written style.

A simple learner-friendly approximation is:

• sekerlik ≈ SEH-kər-lik

A few notes:

• The first syllable se- sounds like se in set
• The middle vowel is often weak, like uh
• The final -lik sounds roughly like lik, not like English like

Afrikaans pronunciation varies a little by speaker, but that approximation will be understood well.

Yes. Just like English sometimes uses the present for the future, Afrikaans can also do that when the context is clear.

For example:

• Ons vertrek môre. = We leave tomorrow.
• Ons kom later terug. = We come back later / We’re coming back later.

But if you want a clear, straightforward will future, sal is the standard choice:

• Ons sal terugkeer.

So sal is not the only way to talk about the future, but it is the most direct one here.