Die gastelys vir die verrassingspartytjie is gereed.

Here die means the.

So:

• die gastelys = the guest list
• die verrassingspartytjie = the surprise party

Also, Afrikaans die is not the English verb die. It is usually pronounced roughly like dee.

Because there are two definite noun phrases in the sentence:

• die gastelys
• die verrassingspartytjie

Afrikaans uses die as the definite article for all nouns, regardless of gender, and also for both singular and plural. That makes it much simpler than in some other Germanic languages.

Gastelys means guest list.

It is a compound noun, and compound nouns are very common in Afrikaans. English often writes these as two words, but Afrikaans often joins them into one word.

A good beginner strategy is to learn gastelys as a complete word meaning guest list.

Vir means for here.

So:

• gastelys vir die verrassingspartytjie means
• guest list for the surprise party

Because Afrikaans commonly forms compound nouns as one word.

So:

• verrassing = surprise
• partytjie = party
• verrassingspartytjie = surprise party

This is normal Afrikaans spelling. English usually writes surprise party as two words, but Afrikaans joins them.

The -s- is a linking element that often appears in Afrikaans compound nouns. It helps connect the two parts of the word.

So:

• verrassing + partytjie becomes
• verrassingspartytjie

As a learner, it is often easiest to memorize the full compound rather than trying to predict every linking sound.

Is is the present-tense form of wees, which means to be.

So:

• Die gastelys ... is gereed means
• The guest list ... is ready

Gereed means ready.

In this sentence it comes after is, so it is a predicate adjective:

• is gereed = is ready

After is, Afrikaans adjectives normally stay in their basic form, so gereed does not change here.

Because surprise party is normally expressed as the compound noun verrassingspartytjie.

If you said verrassende partytjie, that would mean something more like surprising party—a party that is surprising. That is a different idea.

So:

• verrassingspartytjie = surprise party
• verrassende partytjie = surprising party

The sentence follows a very common pattern:

• Die gastelys vir die verrassingspartytjie = subject
• is = verb
• gereed = complement

So the structure is:

Subject + verb + complement

This is the normal word order for a simple statement like this. The subject happens to be a long noun phrase, but it still functions as one unit before the verb.