How to form French Adverbs of Manner

The video tutorial explains how to form French adverbs of manner by adding 'ment' to the feminine singular form of adjectives. It provides examples such as 'lentement' for 'slowly' and 'fortement' for 'strongly'. The tutorial also covers irregular adverbs like 'vite' for 'quickly' and 'bien' for 'well', highlighting exceptions to the rule.

What is the feminine version of 'serieux' and how do you form the adverb?

What are some examples of irregular adverbs in French?