Verbs!

Verbs are doing words. A verb can express a physical action, a mental action, or a state of being.

State of being verb -The verbs which express a state of being are the ones which take a little practice to spot, but, actually, they are the most common. The most common verb is the verb to be.  The most important verb in this group – arguably of all – is the verb to be. As already mentioned, this is seen in forms like is, are, were, was, will be, etc.

http://www.grammar-monster.com/lessons/verbs.htm - Try the three practices

A linking verb connects the subject with a word that gives information about the subject, such as a condition or relationship. They do not show any action; but, they link the subject with the rest of the sentence. For example, in the sentence "They are a problem," the word "are" is the linking verb that connects "they" and "problem" to show the relationship between the two words.

http://www.funbrain.com/verb/ - FUNBRAIN - complete and submit for extra credit
Interactive website - http://www.quia.com/quiz/653873.html?AP_rand=1235829602   Active or linking

Cut out an article - identify (highlight)  all of the verbs and submit it for extra credit.\