How can teachers give effective instructions

Tips for giving effective instructions from Mrs. Wang:
1. use simple instructions and target it at the level of students' linguistic competence
2. Use clear and loud voice
3. Use Chinese when it is absolutely necessary
4. Use body language to assist comprehension
5. Use modeling instead of long and complicated language for instructions
6. avoid doing all the talking in class.

and for the question How teachers can give effective instructions, every teacher himself or herself should think and taste it during their teaching. And researchers should do more to provide teachers more advices and examples.