"I read the book."
Translation:Ik lees het boek.
In English, this could be read as either present tense or past tense. If you're asking "Have you read the book?" to which the answer in this case would be "I read the book". If you would like the Dutch answer to be active tense i.e. 'Ik ben het boek aan het lezen' the more appropriate English sentence would be 'I am reading the book'. Just a thought!