heaviest, largest
Heaviest and largest are both superlative adjectives, which you can find out about by following the link.
more information: superlative adjectives
further
Further is an irregular comparative adjective. Instead of saying 'farer' we say 'further'. Follow the link to find out more.
more information: comparative adjectives
affect
Be acareful not to confuse affect with effect. Follow the link for more information.
more information: effect & affect
driven
Driven is the past participle of the irregular verb drive. Follow the link below to find out more and to listen to some examples.
more information: drive