There are many different types of landforms.
The word 'plain' usually means self-evident, without adornment, or a land form. To use these in a sentence: SELF EVIDENT: "It was plain to the police officer that the criminal has been wounded" WITHOUT ADORNMENT: "She had a very plain and ordinary face with no distinguishing characteristics." LAND FORM: "That is a very flat plain."
The word sentences is a noun. It is the plural form of sentence.
My dad had to fill out my dentist form.
in what a science form ,life form..........
America is the land of opportunity.
the land owner died
I live on two acres of land.
Can I use colonists in a sentence or Can I form a sentence with colonists in it? Yes.
Example sentence - It is important to obey the laws of the land.
Example sentence - New Mexico is referred to as the Land of Enchantment.
if in the situation you have been stranded out at sea you can say. LAND!
Example sentence - His daughter annoyed me all day.