1. we dont understand as many as they do
=> We don’t understand as much as they do.
2. my mother can cook more well than i can
=> My mother can cook better than I can.
3. it gets cold and colder when the winter is coming
=> It gets colder and colder when winter is coming.
4. peter is younger and intelligenter than john
=> Peter is younger and more intelligent than John.
5. his school is two times as big as mine
=> His school is twice as big as mine.