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To all,

I hope someone can help with this question smile

A student wrote the following two sentences.

Driving is extremely faster than walking.
Walking is highly more convenient than taking the bus.

There are, I believe, a few different adverbs you can use here, but it's a question of which ones.
Does anyone know the rules of which gradable adverbs you can use with which comparative adjectives?

Thanks in advance for any assistance.

There is no 'rule' predicting which words will be acceptable, merely conventions of usage. 'Far' and 'much' are the most common/useful.