Someone has put me on to a site which has some useful information, especially a great description of passive and active, even I now understand the difference.
I'm useless at links, so if you google 'online writing lab' - the web not uk pages, you should get one for them called 'Purdue university's OWL family of sites. Click on that, then you will get the OWL family of sites. Click on the orange one - the OWL at Purdue, then click where it says 'the original owl at purdue site can be found via this link, then go to Grammar spelling and punctuation, down to verbs, active and passive.
Phew, sorry it seems longwinded, but it only takes a few moments. Can someone please tell me how to do links, for future use.
Katerina