Wordwizard

a. As rapidly as they are moving, they'll be here soon.

b. As hard as John hit Henry, Henry must be in a lot of pain right now.

Are the above sentences grammatically correct and meaningful?

I am confused.

Generally, when 'as' is used like this with adjectives, the meaning is usually 'although'.

c. As precise as this instrument is, it sometimes gives wrong readings.

I don't think that could be used in a 'positive' sense.



Many thanks

In a) and b), "as" is being used in the sense of "given that", e.g.:

Given that they are moving [so] rapidly, ....

Given that John hit Henry [so] hard, ...

"As" is a word with many applications and nuances of meaning.