Singular:
* I stubbed my foot on the corner of the table. (referring to a body part)
* The foot of the mountain was covered in snow. (referring to a base or bottom)
* He measured the room in feet. (referring to a unit of measurement)
Plural:
* The baby took its first feet. (referring to body parts)
* The feet of the bridge were crumbling. (referring to supports)
* The room is ten feet wide. (referring to a unit of measurement)
Other ways:
* The dog put its paw on my foot. (combining body parts)
* The footprint in the sand was very clear. (related to the word "foot")
* She was at the foot of the stairs. (referring to a location)
Let me know if you'd like more examples or would like to see the word "foot" used in a specific context!