I'm afraid (I tend to get serious easily.)

　I'm sorry, but (I don't have any time to help you.)

　Of course, (I've never gotten into an accident.)

　In my case, (I was able to quit smoking easily.)

　I'd like to, but (I have another engagement.)

　Frankly (speaking), (I'm not suited to be a homemaker.)

　To be honest, (I can't get along with my coworkers.)

　Actually, (I've never been aboroad.)

　All joking aside, (you should get home earlier.)

　As far as I know, (she's still working at that boutique.)

　That reminds me, (I used to be scolded by my father.)

　Changing the subject, (I've built my own site.)