How to use "speaks" in a sentence

I could not silence the voice that speaks to me when I am alone.'

In reality, however, all he does is press 'play' on the recording device and write down a few notes about when the judge enters, when the prosecution or defence speaks, or what the final verdict is

For a second she is silent, but then she speaks again, though this time her voice is hard and angry

Smith speaks up

He speaks English fluently with no accent

She speaks the language and knows a lot about China