Questions & Answers about Ik zie dat je een boek leest.
Why is leest at the very end of the sentence instead of after je?
The word dat (that) introduces a dependent clause. In Dutch, dependent clauses push their verb to the very end. That is why the order becomes dat je een boek leest rather than using the normal main clause order.
Why doesn't the verb zie go to the end of the sentence too?
Because Ik zie is the main clause. In a standard main clause, the verb stays in the normal second position, right after the subject. Only the dependent clause (the part starting with dat) sends its verb to the end.
The English translation says "you are reading". Can leest mean both "read" and "are reading"?
Exactly! Dutch does not use an continuous form as strictly as English does. The simple present tense je leest covers both "you read" (as a general habit) and "you are reading" (happening right now).
Could I use jij instead of je in this sentence?
Yes, but it changes the emphasis. Je is the normal, unstressed word for "you". If you use jij, you are putting special focus on the person, like saying "I see that YOU are reading a book" (perhaps surprised because they usually do not read). Without that special emphasis, je is the most natural choice.