Составить 15 предложений на английском в сравнительной и превосходной степени

1)This bad really heavy, but that piano i think hesvyest.2)Korean food is spicy, but Chinese is more.3) Chemistry is hard, but phisics i think the hardest for me. 4) Bear is fury, but cat furyer him.5)Today is hot, yesterday will be hotter. 6) Norilsk is the cold city of Russia, but Pevesk is the coldest. 7) I'm tired, but my sister is the tirede than me. 8) Math is worse, but chemistry the worst.9)Yesterday was cold, but today is colder.10) i want to sleep. and it hasnt comparative.