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Ron也对比了 到底什么时候用twice as many, twice as much和twice:
Ron: here’s the basic idea:
if you say "twice as many", then this construction should be paired with a countable noun.
e.g., twice as many dogs --> "dogs" is a countable noun
if you said "twice as much", then this construction should be paired with an uncountable noun.
e.g., twice as much water --> "water" is an uncountable noun
if the noun in question is already an explicitly numerical quantity (such as “increase”), then you should use neither "much" nor "many". instead, you should just use "twice" or "double" by itself.
e.g., twice the increase --> "increase" is an explicitly numerical quantity
these rules are followed pretty closely.
so, for instance:
twice as much water --> correct, since "water" is an uncountable noun (but is not an explicitly numerical quantity)
twice the water... --> incorrect, since water is not a numerical quantity
twice as much as the increase... --> incorrect; redundant
twice the increase... --> correct
如果按照LZ后来说的,选twice such farmers... farmers属于可数名词,应该用twice as many as such farmers... 如果只能用一个twice的话,后面应该加一个quantity.
不造我理解对不对。。。。。
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