To all English teachers I'm hopeless please help me!!

[sublime]

I'm new in the field of teaching I came across the use of should have and shouldn't have (task 1 page 45) 2nd year classes. I have no idea how am I going to explain the use of these two to apologize and criticize because it's a bit ambiguous, especially having some pupils who really want to learn english and who question a lot. Would you please give me some instructions on how to teach the use of "should have and shouldn't have"? I'm so hopeless please help me.

[nour.eng]

i hope you find evry thing in these files

السنوات الثانية : الرابط
http://www.4shared.com/zip/EJtnCMQw/2nd_year.html?

[nour.eng]

generally we use " should have" to express appology
eg: sorry, i should have give him his money.
and shouldn't have for criticizing things
eg: normally, i shouldn't have do that

[nour.eng]

generally we use " should have" to express appology
eg: sorry, i should have give him his money.
and shouldn't have for criticizing things
eg: normally, i shouldn't have do that