Houd het boek vast, dan kunnen we straks even overleggen over de inhoud.

Because vasthouden is a separable verb in Dutch: vast + houden.

In a main clause, the verb splits:

• Ik houd het boek vast.
• Houd het boek vast.

But in the infinitive, it stays together:

• het boek vasthouden

So in your sentence, houd ... vast is the normal split form of vasthouden.

Here vasthouden means to hold onto, to keep holding, or to hold firmly.

So Houd het boek vast is stronger than just Hold the book in a neutral sense. It suggests:

• keep it in your hands
• don’t let go
• hold it steady for a moment

The particle vast often adds the idea of firmness, continuity, or keeping something in place.

Because this is the imperative form: a command or instruction.

Dutch often leaves out the subject in commands:

• Kom hier. = Come here.
• Lees dit. = Read this.
• Houd het boek vast. = Hold the book.

The understood subject is usually jij.

If you wanted a more formal version with u, you could say:

• Houdt u het boek vast.

The standard imperative of houden is houd.

So:

• Houd het boek vast.

You may hear hou in spoken Dutch or informal language, especially in fixed expressions like:

• Hou op! = Stop it!

But in standard written Dutch, houd is the safest and most correct form here.

Here dan means something like then, in that case, or after that.

It connects the two parts of the sentence:

• Hold the book, then we can discuss the contents in a moment.

So the idea is:

1. first, hold the book
2. then/after that, we’ll be able to discuss it

It gives the sentence a logical flow.

Because Dutch main clauses follow the V2 rule: the finite verb must be in the second position.

In this clause, dan comes first, so the finite verb kunnen must come next:

• Dan kunnen we straks even overleggen...

Compare:

• We kunnen straks even overleggen.
• Straks kunnen we even overleggen.
• Dan kunnen we straks even overleggen.

In each case, the finite verb stays in second position.

Because kunnen is a modal verb, and Dutch modal verbs usually send the main verb to the end of the clause in the infinitive.

So:

• We kunnen overleggen.
• We kunnen straks even overleggen.

Structure:

• kunnen = finite/modal verb
• overleggen = infinitive at the end

This is very common in Dutch:

• Ik kan komen.
• Wij moeten wachten.
• Zij wil vertrekken.

Straks usually means later soon, in a little while, or shortly.

It does not usually mean a vague far-off future. It often refers to something that will happen:

• later today
• in a few minutes
• after the current task

So here:

• dan kunnen we straks even overleggen means something like
• then we can discuss it in a little while

No, not usually.

In this sentence, even means something like:

• just
• for a moment
• briefly

It often softens the sentence and makes it sound more natural or less heavy.

So:

• even overleggen = just discuss briefly / have a quick discussion

Dutch uses even very often in everyday speech in places where English would not always translate it literally.

Examples:

• Wacht even. = Wait a second.
• Ik kijk even. = I’ll just have a look.
• Kunnen we even overleggen? = Can we talk it over briefly?

Here overleggen means to discuss, to confer, or to consult together.

It often suggests a short exchange to decide or clarify something together.

So:

• we kunnen straks even overleggen means:
• we can talk it over shortly
• we can discuss it briefly in a moment

It is a very common word in work, school, and practical situations.

Overleggen can stand by itself if the topic is already clear:

• We moeten nog overleggen. = We still need to discuss.

But if you want to state the topic, Dutch often uses over + topic:

• overleggen over de inhoud
• praten over het probleem
• discussiëren over het plan

So overleggen over de inhoud is completely normal and means:

• to discuss the contents

Yes, there is an over inside overleggen, but that does not stop Dutch from adding another over for the topic.

De inhoud means the contents or the content.

In this sentence, it most likely refers to the content of the book:

• what is written in it
• what it says
• the material or ideas inside it

So:

• overleggen over de inhoud = discuss the contents / discuss the content

Yes.

In Houd het boek vast:

• houd = imperative verb
• het boek = direct object
• vast = separated particle from vasthouden

So the structure is:

• [Verb] [Object] [Particle]

This is very typical with separable verbs:

• Zet de lamp aan.
• Schrijf het adres op.
• Doe de deur dicht.

In informal speech, some people may say Hou het boek vast. But for standard written Dutch, Houd het boek vast is the better form.

So if you are learning or writing carefully, use:

• Houd het boek vast

That is the form you should recognize and produce.

It has two main clauses joined by a comma:

1. Houd het boek vast

   • imperative clause
   • command

2. dan kunnen we straks even overleggen over de inhoud

   • main clause with dan in first position
   • finite verb kunnen in second position
   • subject we
   • infinitive overleggen near the end
   • prepositional phrase over de inhoud

A rough breakdown:

• Houd = hold
• het boek = the book

• vast = firmly / onto it

• dan = then
• kunnen = can
• we = we
• straks = in a little while
• even = briefly / just
• overleggen = discuss / confer
• over de inhoud = about the contents

So the grammar is very typical, everyday Dutch.