PRESENT SIMPLE
The simple present or present simple is one of the verb forms associated with the present tense in modern English. It is commonly referred to as a tense, although it also encodes certain information about aspect in addition to present time. It is called "simple" because its basic form consists of a single word (like write or writes.
http://en.wikipedia.org/wiki/Simple_presen
PRESENTATION
I think it is very useful to practice grammar
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