Most British students wear school uniform. части речи (тут я не уверена): наречие (частица), прилагательное, существительное, глагол прилагательное? и существительное. Про подлежащее и сказуемой точно сказать не могу, т.к. мы не разбирали.
2 are talking, went, will your brother go, will you invite, goes
3 There are different types of animals and different people like different animals. As for me, I'm fond of cats. I like playing with them. They are so cute! Cats like to sleep. In fact there are only three things, that domestic cats do. They sleep, eat and play games. I like cats, because they help me to relax and forget about my problems