English Prepositions

A preposition is a word governing, and usually coming in front of, a noun or pronoun and expressing a relation to another word or element, as in:

• She left before breakfast.
  
  
• What did you come for?
  (For what did you come?)

  English Preposition Rule

  There is one very simple rule about prepositions. And, unlike most rules, this rule has no exceptions.
  Rule
  A preposition is followed by a "noun". It is never followed by a verb.
  By "noun" we include:
  
• noun (dog, money, love)
• proper noun (name) (Bangkok, Mary)
• pronoun (you, him, us)
• noun group (my first job)
• gerund (swimming)

A preposition cannot be followed by a verb. If we want to follow a preposition by a verb, we must use the "-ing" form which is really a gerund or verb in noun form.
Quick Quiz: In the following sentences, why is "to" followed by a verb? That should be impossible, according to the above rule:

• I would like to go now.
• She used to smoke.

Here are some examples:

Subject + verb	preposition	"noun"
The food is	on	the table.
She lives	in	Japan.
Tara is looking	for	you.
The letter is	under	your blue book.
Pascal is used	to	English people.
She isn't used	to	working.
I ate	before	coming.

Answer to Quick Quiz: In these sentences, "to" is not a preposition. It is part of the infinitive ("to go", "to smoke").