かなI wonder

Originally a mixture of the sentence ending particles か, and な, かな evolved over time to become its own (singular) sentence ending particle, which roughly translates as 'I wonder if (A)?'.

As it is a sentence ending particle, かな can be added to the end of almost any sentence. However, in the case of な-adjectives, both だ and です will usually be omitted, with かな simply following the word stem itself.

Combining the meanings か and な, we can see where かな gets its original meaning. か presents questions (usually to other people), while な shows that a statement is related purely to the speaker's own thoughts/opinions. In this way, かな expresses that the speaker's own thoughts are being questioned.

Fun Fact

In the past, かな was thought of as being a fairly feminine way to express 'I wonder', and males tended to use phrases like だろうか to express the same type of statement. However, in modern day Japanese, かな is used by both men and women equally.