feetnoun1. 
BAD: In front of them was a six-feet wall.
GOOD: In front of them was a six-foot wall.
Usage Note:Using numbers Day, month, minute, mile, kilo etc are always SINGULAR when used (with a number) immediately before a noun: ‘a six-minute wait’, ‘a ten-second silence’, ‘a five-mile race’.
My travel agent had arranged a 6-day coach tour.
The company provides a three-month training course.
Compare: ‘We waited for thirty minutes: ‘We had a thirty-minute wait.’
When you say
100, 1000 etc , or write these numbers in words, use
a hundred, a thousand (WITH
a ):
The palace was build a thousand years ago.
Compare: ‘The palace was built 1000 years ago.’
For emphasis or to be exact, it is possible to use
one instead of
a :
I am one hundred percent against the idea.
After
a/one/five/twelve etc , the words
hundred, thousand, etc are always SINGULAR and are NOT followed by
of :
Five hundred children are born in the city every day.
More than three thousand people were there.
Similarly,
of is NOT used after
100, 250, 3000 etc: If you kill 200 whales a year, they will soon disappear.
Hundreds (of), thousands (of) etc are used only when you give a general idea of how many or how much: ‘There were hundreds of stars in the sky.’ ‘They’ve spent thousands (of pounds) on improvements to the house.’
Use
and between
hundred and the next number. (In American English,
and is often omitted, especially in formal styles.)
BrE The club has about a hundred and thirty members.
AmE The club has about a hundred (and) thirty members.
2. BAD: It shouldn't take more than ten minutes by feet to reach the underground.
GOOD: It shouldn't take more than ten minutes on foot to reach the underground.
Usage Note:See FOOT (
foot)
[TahlilGaran] Dictionary of Common Errors ▲