to do someone’s bidding

to do someone’s dirty work

someone's opinion is wrong

someone's assumption is incorrect

Someone lied.

to be at someone’s disposal

to do someone wrong

Someone stole my credit card.

to someone’s credit

to be on someone’s side

to be on someone’s tail

to do someone’s heart good

to go up in someone’s opinion

to be at someone’s beck and call / to be at the beck and call of someone

to be at someone’s command

to be at someone’s feet

to ID someone

to go to someone’s rescue

someone’s days are numbered

to be at someone’s beck and call

to be in someone’s care

to be in someone’s clutches

to be in someone’s debt

to be in someone’s good books/good favor

to be in someone’s graces