2.- Read the text to know more about Prepositional phrases. Then, click on the link, do the exercise and check your answers.
Prepositional phrases
Prepositional phrases have a preposition as their head: at lunchtime behind the fridge for an interview from eating too much in the drawer
Heads and objects in prepositional phrases
The preposition is usually followed by a noun or noun phrase - lunchtime, the fridge, etc. This is called its object, because the preposition + object combination is rather like a verb + object (e.g. forgot lunchtime, opened the fridge).
Why don't we treat the preposition as a modifier of the object?
Because the preposition doesn't modify the meaning of the object; for example, behind doesn't turn the fridge into a particular kind of fridge.
In fact, the preposition sets up the meaning for the whole phrase, and the object makes it more precise. For example, behind picks out some place, and defines it in relation to something else - the fridge, Mary, the Houses of Parliament, depending on what the object may be. This is why we treat the preposition as the head.of the phrase.