1.No one has seen him anywhere this week.- He has not been seen by anybody anywhere this week.
2.somebody has invited her To the party.- She has been invited by somebody to the party
3.they have done all the exercises in written form.- All the exercises have been done by them in written form
4.they are constructing some new mero lines now- Some new mero lines are being constructed by them now
5.he is examining the last student there.- The last studenthe is being examined by him there
6.I know her family.- Her family is known by me .
7.I am sure they will offer you a very interesting job.- I am sure you will be offered a very interesting job by them
8.they informed me that they had seen you in Oxford Street.- I was informed that you had been seen by them in Oxford Street
9.yesterday I met them walking in the park.- yesterday they were met by me walking in the park
10.they sent you the invitation last week- You were sent the invitation by them last week