You must believe me (along with its variations, such as Believe me, You have to believe me, You should believe me, You better believe me, You'd better believe me, and so on)
Take my word for it
You listen to me
(along with its variations, such as You must listen to me, Please listen to me!, and so on)
Don’t say I didn’t tell you: Two years from now, the GOP will officially split into two parties... (from a news article by Charles Ellison, 2014)
And you can bank on this: while crusades may start out as one-man crusades, if the idea behind the enterprise is good, soon you'll have lots of support. (from Magic of Thinking Big, David Schwartz, 1987)
We can teach all the right responses in the world but if we never role model them - well, """"you can bet your bottom dollar """you won't see them in your children. (from a book on parenting by Eydie Comeaux, 2003)
I'm telling you, there's only one way you gonna get to Norlins now, and that's by cab. (from Old Glory: A Voyage Down the Mississippi by Jonathan Raban, 2011)