Paraphrase the sentences than or as..as
1)Sam is nastier than Dave.(Dave,nice,Sam)
2)English int`t as diffucult as French.(English,casy,French)
3)This book is more boring than that book.(That book,interesting,this book)
4)French isn`t as boring as science.(French,interesting,science)
5)Documentaries aren`t as boring as current affairs programmes.(Documentaries,interesting,current affairs programmes)