The following interpretation is taken from the book Common Mistakes in CAE. Cambridge University Press by Debra Powell.

We use the simple aspect of tenses for actions which we think are:

• finished: I've done my homework. (the homework is finished)

• permanent: I've lived in England for 10 years. I've worked for this company for most of that time. (I think I will remain in England and continue to work for the same company)

We use the continuous aspect of tenses for actions which we think are:

• unfinished or in progress: I've been doing my homework. (it isn't finished yet)

• temporary: I've been living in England for six months. I've been working as an au pair. (I think I will leave England one day- my job is temporary)