1) Understanding why communication is important in the work setting
- you could bring in challenging behaviour (communication, verbal and non-verbal is an essential part of deescalation techniques for example), loss and bereavement and sensory impairment - also the dementia elements as these all require more specialised types of communication/listening.
you might also want to put a wee bit about handovers (verbal or written) in your workplace.
2) Be able to meet the communication and language needs,wishes and preferences of individuals
- use whichever examples from the certificates you didn't mention from the ones i suggested above to do this question too, you can mention things like person centred planning and developing care plans/support agreements that are specific to peoples needs and wishes.
3) Be able to reduce barriers to communication
- again, the above mentioned courses plus mental capacity - challenging behaviour will be particularly interesting in this question.
at a stretch you can also mention that confidentiality and building trust can increase communication, time management can enable you to have more time to communicate/listen/learn about the people you are working with, and understanding paperwork (recording and reporting) is essential to communicating with other staff.
4) Be able to apply principles and practices relating to confidentiality at work
- have a look at the more formal modules; confidentiality, reporting and recording and data protection, and try to think of a real life example of how you use this (e.g where is personal information kept, how do you prevent it being seen by random people, how do you communicate things about people you work with, with staff)
remember that they will want you to mention types of communication, including with your colleagues/organisation/people you are working with
oops, nearly wrote the thing for you!!