ارجو الرد بسرعه

[taaaatoooo]

He'll drive as ( quick - quickly ) as he ( can - could) ولماذا

[Mr Mosaad El Hegazy]

quickly - can
as we need to use adverb to show the way he drives and present tense after the future action

[taaaatoooo]

Thanks alot Mr

[taaaatoooo]

but What about
as adj as

[مصطفى محجوب ثابت محمد]

يمكن وضع الظرف بين as................as

[takoo]

The answer is as quick as he can
it's similar when we say as
please do your homework as possible as you can
not as possibly as you can