After I have marked the dictation exercise books, I should ask my pupils to:
Are these sentences all correct? I 've checked the Longman dictioinary,correction can be both countable and uncountable. Shall I write down "correction" or "corrections" on the top of the exercise books?
To my knowledge, teachers would "red" mark the wrong words/parts/portions/etc and write at the top of the page: "Do/make the corrections" or simply " for correction".