stand up。
sit down。
raise your hands。
look at the blackboard。
attention please。
please be quiet。
listen carefully。
read after me。
one more time come to the front。
go back to your seat。
do you understand。
do you have any questions。
please answer the questions。
can you answer it。
what did you say?
could you say it again。
open your books to page six。
turn to the next page。
close your box。
write it on your notebook。
underline it。
do the exercise。
have you finished。
let's check the answers。
don't forget to do your homework。