Congiunzioni e connettivi

Conjunctions and connectors
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* when followed by a word beginning with a vowel it may change into ed to help pronunciation, e.g. 'tu ed io' (you and I)
* after prima / dopo Italian uses an infinitive form (simple or compound), not use a gerundio.
* Perché indicates a cause and it can't be used to introduce a sentence, unless it is a question.
On the other hand, poiché introduces a cause and it can also be at the beginning of a sentence (like since in English).
* When used as purpose connectors, affinché and perché usually require the congiuntivo (they derive from 'che').
* Però is slightly more adversative than ma.
Used at the end of the sentence it gives a 'though' meaning, e.g. è un bel posto però (it's a nice place, though).
Però can be also used as a freestanding word for expressing surprise or impression, e.g. if your friends hit the lottery, you could say 'però!' (with the right intonationa and facial expression).
* Come se requires a congiuntivo imperfetto.