学生有被尊重、被表扬、被认可的需要
在写作业时，希望得到教师的表扬和鼓励，这是学生精神上的需要。如果精神上的需要长久得不到满足，他们就会产生消极的思想。
教师针对不同的学生及其作业，在不同场合所作的评语可激发学生的学习热情，让优等生更上一层楼，使中等生改正缺点、发扬优点，使暂时落后的学生能克服畏惧心理，树立信心。所以对优等生的作业表扬中要有指正，教师可通过评语向他们提出更高要求。
例句
It's good to be correct.It's also important to be creative.
Excellent.You haven't made any mistakes,but do try to make your handwriting neater.
对中等生的作业要慎重评价，在评语中要多督促。
例句
You had better be more careful!Pay more attention to the tenses.
Your work is quite good
except for a few spelling mistakes.
Keep it up.Remember that little by little one goes far.
对于差生的作业要多点激励，温和地指出错误的同时，也要指出他的优点以资鼓励。
例句
Lily,I like your handwriting very much although there are some mistakes here.
I am sure you can correct them.
Bill,I think you can do better if you work harder.
Your work has improved.I am sure there is nothing too difficult for us to learn.