Speech acts are of great importance primarily within the bounds of semantics and should be on the basis of mutually shared back ground information between hearer and speaker. Curses and prayers are commonly used in every day language. Whenever some one does a favor to us, we may say a prayer to God for him/her. We may curse at some one for making us angry or sad. By and large, we express our inner feelings and attitudes towards the hearer through saying prayers or curses: therefore, they are involved in expressive speech acts. The present article delivers a special classification of prayers and curses which are as follows: a) prayers and curses which are closely associated with our culture, tradition and religion; b) prayers and curses which have been progresses and produced gradually and no specific cultural root can be traced for them. This type of speech acts is itself classified into two categories: the first one is composed of prayers and curses which are frequently used by children in different contexts and the second category comprises those prayers and curses which English speakers have in common with Persian speakers.

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