Chapter of Thinking
[for fun]
Thinking about is an action applying to one visible thing.
Understand "worry about [any thing]" as thinking about.
Understand "think about/of [any thing]" as thinking about.
Carry out thinking about:
say "So, you think about that for a while."
Worrying about is an action applying to one topic.
Understand "worry about [text]" as worrying about.
Understand "think about/of [text]" as worrying about.
Carry out worrying about:
say "So, you think about that for a while."