You really need to provide access to a basic grammar source in this program - for example - in numbers to know to drop the "o" from tercero in front of a masculine word ---- and.... many other intricate points!!!!!
I have a good Spanish/English dictionary (hard copy) at hand, which is quicker than searching elsewhere or even on this program, if it had a dictionary. The grammar rules are included there. I just use a paperback, which you can find used on Amazon, really cheap. Light and handy.