1. right?; isn't it?; doesn't it?; don't you?; don't you think? (at sentence end; used as a request for confirmation or agreement)

2. hey; say; listen; look; come on

3. you know; you see; I must say; I should think (at sentence end; used to express one's thoughts or feelings)

4. will you?; please (at sentence end; used to make an informal request)

5. so, ...; well, ...; you see, ...; you understand? (at the end of a non-final clause; used to draw the listener's attention to something)

6. I'm not sure if ...; I have my doubts about whether ... (at sentence end after the question marker か)