Two guards examined the BMW. → The BMW was examined by two guards.
Renoir painted the same road a few months later. → The same road was painted by Renoir a few months later. Or 'The same road was painted a few months later by Renoir' is also acceptable.
His critics were attacking him on all sides. → He was being attacked by his critics on all sides. Or 'He was being attacked on all sides by his critics' is also acceptable.
Carrie kissed Jack. → Jack was kissed by Carrie.
PC Michael Packwood interviewed Mr Forty after the accident. → Mr. Forty was interviewed by PC Michael Packwood after the accident. Or 'Mr. Forty was interviewed after the accident by PC Michael Packwood' is also acceptable.
The words taunted her. → She was taunted by the words.
Mr. Howard underestimates the Prime Minister. → The Primer Minister is underestimated by Mr. Howard.
Egypt, Israel, the Republic of Korea, Mexico and Morocco have signed the articles too. → The articles have been signed by Egypt, Israel, the Republic of Korea, Mexico and Morocco too.