1. They are trying to understand every word
2. They get left behind trying to work out what a previous word meant
3. They just don't know the most important words
4. They don't recognise the words that they know
5. They have problems with different accents
6. They lack listening stamina/ they get tired
7. They have a mental block
8. They are distracted by background noise
9. They can't cope with not having images
10. They have hearing problems
11. They can't tell the difference between the different voices