Grammar lesson

Knowing what English grammar is and being able to use it correctly in a sentence is one thing -- trying to teach it to a group of students who can barely speak English is another.
We both had to teach our first grammar lesson this week. It was much more difficult than our reading and listening lessons. Jason had to teach comparatives and superlatives and I had to teach the present perfect (I have been ....). We did both pass (whew!), but it was the lesson we both had the most trouble with.
Starting next week we switch to a new group of students and a new trainer. We had been teaching pre-intermediate level students and started next week we move to upper-intermediate. This had its ups and downs. For one thing, they know more so we won't have to worry as much about saying things that they don't understand. But, by the same token, they know more so and so they ask more complicated questions. Plus, the trainer (the person who evaluates us) for the upper-intermediate level has made it perfectly clear that he is prone to failing people (AH!). He has reassured us, however, that even if we fail a lesson (or two) that we can still pass the class overall. Still, I am a little nervous about all of this.
We went out tonight to celebrate one of our classmates' birthday. We went to a restaurant that we had heard had a bowling alley in it. It turned out that there were only two lanes and they were booked all evening so we didn't get to bowl. But, the food was excellent.
After we went to a bar that had a rock-climbing wall (but it wasn't open tonight). We did play some foosball and tried our second Czech beer. This time we had Kozel. It was a dark beer and I liked it much more than the Krusovice. Jason still wasn't terribly crazy about it.