1.Mr Smith is wealthier than Mr.Brown.
=>Mr.Brown is poorer than Mr Smith.
2.My house is smaller than my parent's house.
=>My parent's house is bigger than my house.
3.The black dress is more expensive than the red one.
=>The red dress is cheaper than black dress.
4.Today it is colder than yesterday.
=>Yesterday is hotter than today
5.I don't think you are taller than me.
=>I don't think i am shorter than you.