Questions & Answers about Hij leest het vijfde hoofdstuk.
Because the subject is hij (he), which takes the third-person singular form of the verb.
The infinitive is lezen (to read). In the present tense:
- ik lees = I read / I am reading
- jij leest = you read / are reading
- hij leest = he reads / is reading
- wij lezen = we read / are reading
So hij leest is the correct form.
It can mean both, depending on context.
Dutch often uses the simple present where English might use either:
- He reads the fifth chapter
- He is reading the fifth chapter
If you want to make the progressive idea extra clear in Dutch, you can also say something like:
- Hij is het vijfde hoofdstuk aan het lezen.
But the original sentence is completely normal.