Now that I come to think about it, you’re right to dismiss him.
Now that I come to think about it, how ignorant I was!
Now that I think about it, you are wise not to have accepted him.
Now that I think about it, he is a person really worth trusting.
A: Where did you put my dictionary?
B: I’m sorry, but I can’t remember where I put it last.
A: But that’s my favorite dictionary.
B: Wait, now that I think about it, I left it on the kitchen table.
A: How could you be so careless? You should be more careful with other people’s things.
B: Sorry. I’ll be more careful next time.