>>>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.
>>
>>There is a grammar checker in Word.
>
>...which is so HORRIBLE it's 100% useless.

Do not be so critical, even though I agree with you. Let us say that it is 99.9% useless. :)