I'd be interested in knowing exactly how much time you had with that first class; in addition, I'd like to know if you feel as though your students actually learned all that information. My feeling is that the material was presented on an introductory basis; that is, you can't have moved very far beyond those fundamentals in your next class.

I'd also like to know if you're referring to an ESL class or an EFL class. Although there is quite a difference between the two, they are often misused in this forum. The reason I ask is that a beginning ESL class would certainly have had more exposure to the basics you taught them than would an EFL class; therefore, I would find it more believable that they actually acquired the language you presented to them. The exception, of course, being newly arrived immigrants who hadn't had any prior exposure to the language.

Aside from the above questions, though, I do agree that your approach is correct and wish you luck in your future endeavors.