Nashriyot-matbaa ijodiy uyi

Gr  -  grammar  mistake,  Sp  -  wrong  spelling,  WO  -  word  order  mistake,  P  - 
punctuation.
c Self-checking method Pupils check their own work following a given model 
(for example the teacher asks pupils and writes the correct answers on the board.)
d  Inter-checking  method  The  teacher  asks  pupils  to  swap  their  work  and     
correct any mistakes following a model which they are given.
When?
a While pupils are doing classwork activities, you can go round and quickly 
and look at their homework. It is a good idea to ask pupils to have two exercise 
books. One for classwork and one for homework.