when it comes to + N/Ving     說到.....

= speaking of + N/Ving

此處 to 及 of 皆為介詞

例:

When it comes to singing, none beats John.

=Speaking of singing, none beats John.

When it comes to music, John is in the know.

=Speaking of music, .....

For many middle-aged people, when it comes to preparing for retirement, they are not quit sure about how much money they should save and spend.