This just sort of came to me. Basically you take the last word of the sentence before you and make it into a sentence, starting the sentence off with that word.
Sometimes it's hard to make a sentence out of words like "Do", so it'd be best to try to end the sentence with a word that can be used easily.

:
To start it...
People hold cameras
[EDIT]Well all those weird rules can be pretty much ignored. Sentences can be longer than 3 words and you don't have to end it in a noun. Seems to work alot better that way.

:[/EDIT]