Passive voice check

Hello,

I´m trying to make a list of the passive voice in various tenses. Could somebody please double check that these are correct or add some more?

A letter was written to the government about their politics.
A letter has been written to the government about their politics
A letter is going to be written to the government about their politics
A letter will be written to the government about their politics
A letter will have been written to the government about their politics
A letter had been written to the government about their politics



A letter about the government's politics is going to be written
A letter about the government´s politics will be written

A letter about their politics is going to be written to the government
A letter about their politics has been written to the government
A letter about their politics will be written to the government
A letter about their politics is being written to the government
A letter about their politics had been written to the government
A letter about their politics will have been written to the government

A letter about their politics will be written to the government
A letter to the government about their politics is going to be written
A letter to the government about their politics has been written
A letter to the government about their politics will have been written

Thank you.