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Pozycja	Wyrażenie	Strona	Skrawek
4	present perfect	/the-rules-of-presen...	The rules of Present Perfect tense « Online Lessons The Present Perfect tense is used to link the past with the present . Here are the key rules for using the Present Perfect tense: 1. Formation of the Present Perfect
9	a an the	/mastering-english-a...	Mastering English Articles: A , An , The , or Nothing? The indefinite article ( a , an ) is used before a noun that is general or when its identity is not known. There are certain situations in which a noun takes no article.