Subject verb Agreement

Basic Rule

The basic rule states that a singular subject takes a singular verb, while a plural subject takes a plural verb.
NOTE: The trick is in knowing whether the subject is singular or plural. The next trick is recognizing a singular or plural verb.
Hint: Verbs do not form their plurals by adding an s as nouns do. In order to determine which verb is singular and which one is plural, think of which verb you would use with he or she and which verb you would use with they.
Example:
talks, talk
Which one is the singular form?
Which word would you use with he?
We say, "He talks." Therefore, talks is singular.
We say, "They talk." Therefore, talk is plural.


http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/sv_agr_quiz.htm

http://grammar.ccc.commnet.edu/grammar/cgi-shl/quiz.pl/agreement_add1.htm

http://www.cityu.edu.hk/elc/quiz/subverb1.htm

http://www.towson.edu/ows/exercisesub-verb2.htm

http://xnet.rrc.mb.ca/leshanson/Hot_Potato/SV_Agreement_6.htm

http://www.wisc-online.com/Objects/ViewObject.aspx?ID=WCN3302

http://a4esl.org/q/h/vm/svagr.html

http://www.eslbee.com/sv.htm