Hi, I’m Italian and I’m studying English as a second language.

I’m having problems with the use of the pattern

“more/less THAN half/twice AS MUCH/MANY …”

because I’m not sure which one must follow between “AS” and “THAN”.

Reading articles on magazines and on the internet I’ve found both cases.

For instance:

Car steering wheels carry **more than twice as many** germs **AS **a toilet seat, according to research

**More than twice as many** home computers are thrown away **THAN **are recycled

People may prefer a more relaxed lifestyle, but I drive **less than half as much** **AS **I did when I lived in the suburbs.

**Less than half as many **tons of newspaper are recycled each year **THAN **are of corrugated cardboard

So, am I to conclude that both “AS” and “THAN” are always possible? Or is there a difference between the two that I failed to detect?

Could you please explain to me the correct rule (if any)?

Thank you very much in advance.

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