Heaviest and largest are both superlative adjectives, which you can find out about by following the link.

Further is an irregular comparative adjective. Instead of saying 'farer' we say 'further'. Follow the link to find out more.

Be acareful not to confuse affect with effect. Follow the link for more information.

Driven is the past participle of the irregular verb drive. Follow the link below to find out more and to listen to some examples.