1The suffix '-ful' is added to 'hope' to form the word 'hopeful'.
2What is the suffix of the word 'happiness'?
3The suffix '-ly' is used to form adverbs from adjectives, such as 'quickly' from 'quick'.
4Adding the suffix '-ment' to a verb can form a noun, as in 'development' from 'develop'.
5The suffix '-able' is used to form adjectives that describe something that can be done, such as 'breakable'.