Please help me I am still having trouble with subject complements

As Ms. Sue explained earlier, subject complements are those words on the other side of the verb from the subject which completes the meaning of the subject.

http://www.ucalgary.ca/UofC/eduweb/grammar/course/sentence/2_1c.htm

http://grammar.ccc.commnet.edu/grammar/objects.htm
Scroll down for complements.

http://www.sil.org/linguistics/GlossaryOflinguisticTerms/WhatIsASubjectComplement.htm

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