Could anyone explain the differences between "to like", "to be fond of" and "to keen on" please?
What are the nuances of meaning and use?

Question

Answer

"fondness" is a form of "liking" in which you also have affection.  "fondness" comes mainly from the heart.  "like" is a simpler, more neutral word.  e.g. I don't see my little nephew much but I am very fond of him and enjoy seeing him when I can.

"keenness" is about interest and enthusiasm though has three main slightly different senses;

a) I am keen on tennis (I like tennis and take an interest in it)
b) I am keen on that girl (I am interested in getting to know her and have a relationship with her)
c) I am keen to start the presentation (I am ready and almost impatient to start it)

Kind regards, Michael

Answer

...and "to BE keen on"