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.
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.