This is very common at this age even when there is only one language being spoken! Developing the skill of relating an event takes practice, and as you have discovered, kids often are reluctant. I would suggest a trip to the library to find materials your son actually enjoys. Some possibilities:
- Non-fiction. Boys often prefer this to fiction stories. He can pick books about robots or sharks or dinosaurs or race cars - whatever interests him!
- Magazines. There are lost of them geared toward kids, and the articles are short, which helps in this situation.
- Comics or graphic novels. Comics are in strip form (like Garfield or Snoopy), where graphic novels look like comics but tell a longer story.
- Fiction of his choice. Perhaps he would like a particular type of story. Ask the librarian for suggestions. He or she is trained to help discover your child's interests.
The key to getting kids interested and comprehending is often by tying the activity to a desire for information. If your child wants a dog, get some books about dogs and read together to figure out what kind to get. If he shows an interest in construction vehicles, get a book to see how they work. If he sees an animal at the zoo, say to him, "I wonder why giraffes do that?" and then get a book about giraffes to find out together.
Also remember that kids come to this when they are ready, and some kids aren't ready for reading until closer to 7 years at which point they often catch up to their peersquite quickly. Keep exposing him to reading and talking to him about what you are reading. He will get there!