With dat (that) you make one sentence out of two. That's how you say what you think, hope or know, or what someone else says.
Dutch · English
English says I think for both. In Dutch, vinden is your opinion (Ik vind dat de film mooi is) and denken is what you believe or expect (Ik denk dat de film om acht uur begint).
The part after dat is a bijzin. In a bijzin, the conjugated verbum goes to the end, just like after omdat.
Main clause → after dat
Usually the subject comes straight after dat: dat hij …, dat Nederlands …. Then the rest, and the verb last.
The comma. You don't need a comma before dat. In a short sentence, leave it out: Ik denk dat hij komt. In a long sentence a comma is allowed if it makes the sentence easier to read.
With a modal verbum (kunnen, willen, moeten …) or the perfectum, you have two verbs. Both go to the end of the bijzin.
Dutch · English
You'll also hear the other order, especially with the perfectum: dat je het examen gehaald hebt (and, less often, dat hij morgen komen kan). Both orders are correct. What matters: the verbs stay together at the end.
A separable verbum (aankomen, meegaan) comes back together at the end, written as one word:
Compare: dat de trein om 8 uur vertrekt (not separable) and dat de trein om 8 uur aankomt (aan + komen).
With vinden you can give your opinion in two ways. Both are correct and mean almost the same.
The short one is very common when you speak. Just don't mix the two: Ik vind dat het leuk ✗ has no verb. After dat you always need one: dat het leuk is.
In English you can drop that: I think he's right. In Dutch you can't. Dat always stays.
English · Dutch
For a short answer, use het instead: Komt hij morgen? – Ik denk het wel. (I think so.) – Ik denk het niet. (I don't think so.)
Another way to give your opinion is volgens mij (I think, in my opinion). After volgens mij there's no dat and no bijzin. Volgens mij takes position 1, so the verb comes next, before the subject: inversie.
Dutch · English
Compare: Ik denk dat het waar is (verb at the end) and Volgens mij is het waar (verb in position 2). To ask for someone's opinion: Wat vind jij? or Wat denk jij?
Wrong · Right · Why
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