Can someone help with a couple of quick English Questions???

I was in russia for a few months this year and have kept in contact with a couple college girls. They always ask for help with their English work, which usually is really easy basic using the correct word multiple choice type stuff. Well my gf that I had there asked if I could help her with something and her work is a little harder.

This stuff might be super basic but I'll be honest, English was my worst subject and I barely scraped by. so if anyone can help, it would be much appreciated!!!

1.Copy (or translate) sentences in Passive Voice. Define time and a predicate kind

- The emu and the kangaroo are represented on the emblem of Australia.
- The Australia contribution to research was connected with geography.
- By the begining of the 17th century Australia had discovered by Dutch explorers
- In 1956 the Olimpic Games were held in Melbourne/\.

2.Replace modal verbs with their equivalents and put their last and future form of time Simple, active voice.

- The emu is a large bird which cannot fly, but runs well.
- you may see most exotic animals in Australia
- There must be many tourists in Australia