Remember that when an adjective is short (it has one syllable or two syllables and ends with -y ) we use the -er to make the comparison and then we use the word than which means (que). Look at the example:
Sara is taller than Maria.
Sara es más alta que María.
Sara is funnier than Maria.
Sara es más divertida que María.
If the adjective is long (it has two or more syllables), we use MORE + adjective + THAN
Look at the example:
Maria is more beautiful than Sara.
Maria es más guapa que Sara.
Now do the activities, remember that in that wonderful site englishexercises you can find more activities to revise lots of aspects about grammar and vocabulary.
