>>>>Hi everybody,
>>>>
>>>>I am wondering if there is some online dictionary where I can check if I used the right preposition in a phrase? Say, often after I've written a phrase I have a feeling that something is not exactly right. I want to be able to quickly check myself.
>>>>
>>>>Thanks in advance.
>>>
>>>That's not going to be an easy task. You know how to diagram a sentence? Might look here: http://www.english-grammar-revolution.com/prepositional-phrase.html
>>>
>>>There is a preposition in a phrase - but there is also something called a prepositional phrase.
>>
>>And what is the difference?
>
>Well one is a word the other is a whole phrase.
>
>So if you have this:
>"At home."
>
>"At" = preposition;
>"home" = noun.
>"At home." = prepositional phrase.

A preposition is something that you should never end a sentence with.
(That, of course, is nonsense up with which I do not intend to put.)