For "a" you probably should have included its use as the "personal" preposition when referring to humans as direct objects. This is possibly the most confusing use of a preposition in Spanish since it signifies absolutely nothing to an English speaker. I've found many Spanish speakers don't understand it. You included "tras" but not "ante"? I see "ante" on signs everywhere telling me what I have to do *before* entering a venue or getting on a bus. Very important!
![1100 most common phrases in Spanish[part 1]1](http://i.ytimg.com/vi/o33OgSeDDzQ/mqdefault.jpg)
![1100 most common phrases in Spanish[part 1]1](/img/tr.png)
![spanish lessons....100 Most spoken spanish words.[Part1].](/img/n.gif)
For "a" you probably should have included its use as the "personal" preposition when referring to humans as direct objects. This is possibly the most confusing use of a preposition in Spanish since it signifies absolutely nothing to an English speaker. I've found many Spanish speakers don't understand it.
You included "tras" but not "ante"? I see "ante" on signs everywhere telling me what I have to do *before* entering a venue or getting on a bus. Very important!