I haven't met him yet.
We can construct a sentence with a similar meaning to the one above using a "yet-to" type construction:
Here the word yet follows the auxiliary verb and is followed by a to-infinitival clause. However, the biggest difference between this construction and the original sentence is that this original uses a negative clause, whereas the yet-to construction uses a positive one. The flavour of the sentence is something like: I haven't met him and my meeting him is going to happen in the future, - if it ever happens at all.
Notice that the sentence in the exercise is:
- Michael Owen is the best player I've seen so far in this competition.
We might expect that to get an equivalent meaning we could write:
- I've yet to see a better player than Michael Owen in this competition.
However, this sentence does not mean the same thing as the Original. The reason is that the sentence above could be true if you had seen many players who were as good as Micheal Owen, but none that were better. In the original example, this is ruled out because Michael is the best. Because the new sentence has a negative meaning we need to say that I haven't seen one who was even as good as Michael Owen. Notice that adjective phrases modified by as occur before the whole noun phrase, not directly before the noun:
- as good a meal.
- *an as good meal. (ungrammatical)
So here we need:
- I've yet to see as good a player as Michael Owen in this competition.
Alternatively, we could use the adverb such instead of the adverb as. Notice that such modifies whole noun phrases. It doesn't modify adjectives:
- such a good meal
- *a such good meal (ungrammatical)
If we use such the sentence will be like this:
- I've yet to see such a good player as Michael Owen in this competition.