Learn Hardcore Dutch: Hij doet de verwarming aan, want het is koud. - He turns on the heating, because it is cold.

It’s the present‐tense form of the separable verb aandoen, literally “to do on,” but idiomatically “to turn on.” So hij doet de verwarming aan means he turns the heating on.

Why is aan at the end of the sentence?

Because aandoen is a separable verb. In a main clause the verb’s particle (aan) splits off and moves to the end: • infinitive: aandoen
• present tense: hij doet … aan

What exactly is a separable verb in Dutch?

A separable verb consists of a base verb plus a particle that can stand apart. Examples: • aandoen → doet ... aan (to turn on)
• opstaan → staat ... op (to get up)
In main clauses you split and send the particle to the end; in infinitives and subordinate clauses you keep them together.

Why is it de verwarming and not het verwarming?

Dutch has two article genders for nouns: de (common) and het (neuter). Nouns ending in -ing are almost always common gender, so they take de.

Can you say hij zet de verwarming aan instead of hij doet de verwarming aan?

Yes. aanzetten (“to switch on”) is a close synonym of aandoen (“to turn on”).
• hij zet de verwarming aan
• hij doet de verwarming aan
Both are perfectly natural.

What does want mean here, and why is there a comma before it?

want is a coordinating conjunction meaning because or for. It connects two main clauses without changing word order: • Hij doet de verwarming aan, want het is koud.
The comma is optional but common to mark the pause before want.

What’s the difference between want and omdat?

Both mean because, but they behave differently: • want keeps normal word order in the second clause: want het is koud.
• omdat sends the verb to the end: omdat het koud is.

In het is koud, what does het refer to?

It’s a dummy pronoun, like English it in it is cold, used to describe weather or general conditions. There’s no real antecedent.

Why is the word order het is koud and not koud is het?

Dutch follows the Subject‐Verb‐Object (SVO) order in main clauses. Here: • Subject: het
• Verb: is
• Complement: koud
So het is koud matches the normal pattern.