Unit 1 - Lesson 2 - Section C - Grammar - Page 7

C) Grammar

Yet - Used in 2 places
   a) end of the question - Have you seen Riyadh yet?
   b) negative statements - We haven't seen Egypt yet.

Already - Used in positive statements after has/have
   
I have already eaten Mandi.    

Ever and before used only in questions.

Has he ever gone to UK?
Has she gone to USA before?

Please revise:

http://bengpy.blogspot.com/2015/02/unit-1-present-perfect-yet-page-6.html

http://bengpy.blogspot.com/2015/02/unit-1-present-perfect-yet-page-6_11.html

http://bengpy.blogspot.com/2015/02/unit-1-present-perfect-ve-yet-page-6.html

http://bengpy.blogspot.com/2015/02/unit-1-present-perfect-ever-pages-6-7.html