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To show difference: more, less, fewer + than

Examples:

With countable nouns: more / fewer

• Eloise has more children than Chantal.
• Chantal has fewer children than Eloise.
• There are fewer dogs in Cardiff than in Bristol
• I have visited fewer countries than my friend has.
• He has read fewer books than she has.

With uncountable nouns: more / less

• Eloise has more money than Chantal.
• Chantal has less money than Eloise.
• I spend less time on homework than you do.
• Cats drink less water than dogs.
• This new dictionary gives more information than the old one.

So, the rule is:

MORE + nouns that are countable or uncountable
FEWER + countable nouns
LESS + uncountable nouns

Rules

To show no difference: as much as , as many as, as few as, as little as

• as many as / as few as + countable nouns
• as much as / as little as + uncountable nouns

Examples:

With countable nouns:

• They have as many children as us.
• We have as many customers as them.
• Tom has as few books as Jane.
• There are as few houses in his village as in mine.
• You know as many people as I do.
• I have visited the States as many times as he has.

With uncountable nouns:

• John eats as much food as Peter.
• Jim has as little food as Sam.
• You’ve heard as much news as I have.
• He’s had as much success as his brother has.
• They’ve got as little water as we have.

Usage

To compare people, places, events or things, when there is no difference, use as + adjective + as:

Examples

• Peter is 24 years old. John is 24 years old. Peter is as old as John.
• Moscow is as cold as St. Petersburg in the winter.
• Ramona is as happy as Raphael.
• Einstein is as famous as Darwin.
• A tiger is as dangerous as a lion.