Move and delete by sentence?

Are there any keystrokes or even mouse clicks which will let us use sentences as their unit of selection? Very often I want to delete to the beginning of a sentence that needs restarting, or delete to the end of one that has gone wrong. I have set up controls to do this in openoffice, and an very reluctant to abandon them. There is also the ability to select whole sentences in order to move them about, and to move through text by sentence.

I don’t know if these come naturally with a mac and have been lost in transition, but they would certainly improve Scrivener for windows.