Here are some helpful tips we've compliled about tutoring teaching. We hope they prove useful.

Formal and informal language
A Job Interview
"Alright Mr. Jones?"
"How's it going Mr. Bradshaw?"
"Sit down."
"Cheers."
"What do you want to work here for?"
"Well, I reckon it's a wicked company and the job sounds cracking."
What strikes you as strange about the above? Of course, the formality and register of the conversation is all wrong. The best way I've found of dealing with formal and informal situations is to create a conversation similar to the above one, and ask students to rewrite it, substituting the words and expressions that are too informal with more formal equivalents. This skill is tested in the First Certificate exam, but can be made more humorous in a class situation, especially if you get students to act it out.
Pete's hidden word game
This game can be a lot of fun when you have an animated class. You choose one word for each member of the class, write that word down on a piece of paper, but don't show it to anyone. You then explain to the students that they must speak for two minutes about a subject that you will give them. They must include the word or expression that you have written on the piece of paper in the talk. The students who are listening must guess what that word is. For example, a student has two minutes to talk about habits and customs in their country. They have 30 seconds to think about what they are going to say and are given a piece of paper with the word lightning on it. They must then try to incorporate the word naturally into their speech so that the other students can't guess what it is.
Some of the speeches that come out of this are priceless! Try to make sure the words you give them and the subject they should talk about are very different.

Helpful tips for busy teachers, arranged by skill
Grammar
Vocabulary
Reading Comprehension
Listening Comprehension
Writing
Speaking
Pronunciation