There are two main reasons to use the word "foot."
First, it’s a part of the body.
The second reason for using the word "foot" is as a unit of measurement. Most people in the United States aren’t very good at measuring things with the metric system. Instead, we use inches, feet, and yards.
a ruler measures one foot
An important thing to remember when measuring things is that units of measurement are often combined with numbers to describe length, height, and distance. When this happens before a noun, don’t use the plural form.
Do you understand the differences in the sentences above?
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February 22, 2013