Talking about Glogs, this is an excellent one if you want to learn all about passives.

All about passives, go through this excellent glog by englishtips. Play the games, watch the explanations, do the exercises. After doing everything, you'll be able to do any kind of passive sentence. 

Do you know what a Glog is? Have a look at this one on the past and practise it!

Have a look at this Glog and have a good time practising the past tense form