Your credibility begins when you open your mouth, she said. 
She said that your credibility starts when you start speaking.
A person's credibility begins when they sign their name on a contract.
A little boy is swimming.
No one was there.
Sports are being played.
There is no overview of the state planning process.
Miss Howard was outspoken and known by many local people.
The city of Miletus has lost its former power to the silt of the river.