Find ONE mistake in each of the following sentences and correct it.
1.English is easier Chinese.
....................easier than..............................................................................
2.China's popullation is more bigger than Japan's.
....................................bigger................................................................
3.She is more happy today than she was yesterday.
.............................happier........................................................................
4.She is much intelligent than her brother.
.........................more............................................................................
5.This car is badder than that one.
......................worse...............................................................................