How to use "repeat" in a sentence

'I repeat, you have nothing to tell me.'

They plugged it in and tried to get it to repeat what it had done earlier, but they had no luck; the machine behaved exactly as it was meant to behave.

Elliot shook the machine harder than he had done the last time, then harder still, but it continued to repeat the two-word message in the voice of the country singer, as if an invisible hand were holding the pick-up stylus or laser-disc reader firmly in place.

He said he'd come for two reasons: first, to express his feelings for me (I refused to listen to them) and secondly, to repeat the warning in his letter