Anna zou de tent beter hebben vastgezet als zij de storm had gehoord.

Breakdown of Anna zou de tent beter hebben vastgezet als zij de storm had gehoord.

Anna
Anna
zij
she
hebben
to have
beter
better
als
if
horen
to hear
de storm
the storm
zou
would
de tent
the tent
vastzetten
to secure
had
had
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Questions & Answers about Anna zou de tent beter hebben vastgezet als zij de storm had gehoord.

Why does this sentence use zou … hebben vastgezet instead of just zou vastzetten?
Because we’re talking about a counterfactual action in the past (“would have done”). In Dutch you form the past conditional with zou + perfect infinitive (here hebben vastgezet). If it were a simple future-in-the-past (“would secure”), you’d say zou vastzetten, but that doesn’t express “she didn’t do it because she didn’t hear the storm.”
How would I translate Anna zou de tent beter hebben vastgezet als zij de storm had gehoord into natural English?

A good rendition is:
Anna would have secured the tent better if she had heard the storm.

Why is the verb vastzetten split into vastgezet at the end?
Vastzetten is a separable verb. In the perfect (and in any infinitive cluster) the prefix vast- attaches to the past participle gezet, giving vastgezet.
Why do hebben and vastgezet come after beter? For me it feels like too many verbs at the end.

In a conditional perfect you have three components at the end:

  1. An adverb (beter)
  2. The auxiliary hebben
  3. The past participle vastgezet
    The order is fixed: adverb → auxiliary → participle. You can also say beter vastgezet hebben, but standard Dutch keeps hebben right before the participle in an infinitive cluster.
Why is the “if” clause in the past perfect (had gehoord)?
Dutch uses the pluperfect (had gehoord) for unreal past conditions—just like English “if she had heard.” It shows that the hearing of the storm didn’t actually happen.
Can I say als zij de storm gehoord had instead of als zij de storm had gehoord?
Grammatically both orders are possible in Dutch, but the more neutral word order is als zij de storm had gehoord. Putting gehoord before had sounds poetic or outdated.
Why is it als zij and not just als ze?

Zij is the stressed form (“she”). In informal speech you often use ze, so you could say:
Anna zou de tent beter hebben vastgezet als ze de storm had gehoord.

Could I start with the “if” clause instead?

Yes. If you flip the clauses, you need a comma and verb inversion in the main clause:
Als zij de storm had gehoord, zou Anna de tent beter hebben vastgezet.

What’s the difference between zou hebben vastgezet and simply had vastgezet?
  • had vastgezet is past perfect (“had secured”), stating she actually did it.
  • zou hebben vastgezet is conditional perfect (“would have secured”), imagining a past action that didn’t happen.
Can this sentence also express advice, like “she’d better have secured the tent”?

No. Dutch uses beter here as an adverb (“better”) in the conditional, not as “had better” in English. To give advice after the fact you’d say something like:
Ze had de tent beter vastgezet. (She really should have secured the tent.)