Door is a noun not a preposition.
I think Knock on the door makes more sense. Knock at the door.... What do you knock on at the door? the wall?
Door jamb is the name for the frame of a door. That is the normal proper use. Door jam COULD be used if the door is stuck and will not open, but would not be the ordinary use.
a door
The green door essay is simply an essay that talks at length about the green door.
Door in Danish is "dor"
Behind that prepositon.
Try to put yourself in the shoes of the prepositon. Compare your topic to your life. Find similarities between the topic and yourself and how it applies to you in everyday life
Parts of Speech 1. Nouns 2.Pronoun 3.Verb 4. Adjectives 5.Prepositon 6.Adverb 7.Conjunction 8.Interjection
I spoke to... The prepositon TO must be used after the verbs TO SPEAK and TO TALK.
The Latin equivalent of the English statement 'Under the shade your flourish' is Sub umbras floret. In the word-by-word translation, the prepositon 'sub' means 'under'. The noun 'umbras' means 'shades, shadows'. The verb 'floret' means '[he/she/it] does flourish, fluorishes, is fluorishing'.
A door is not a door when it's 'ajar'...
Door-to-Door Marketing
In the sentence "Which one of the following words represents an object of a preposition?", "Of the following words" and "Of a preposition" are prepositions. The object of a prepositon in each would be "words" and "prepositions".
Door Door happened in 8801.
a door
Door Door was created in 1983-02.
door to door salesmen, of course