particle:

• you said; he said; she said; they said - casual quoting particle ➜ と
• if ... then - indicates supposition
• do you seriously think that - as かって; indicates a satirical or rhetorical question
• I already told you; you should know by now that; of course - indicates certainty, insistence, emphasis, etc.
• the said ... - abbr. of という
• says that ... - abbr. of と言っている
• I hear that ... - abbr. of と聞いている
• as for the term ... - abbr. of とは, というのは
• as for ... - equiv. of は topic marker

particle:

• speaking of - indicates emotional closeness or annoyance with someone - colloquialism
• (I told you) already; come on - indicates annoyance (in sentence-final position) - colloquialism