What are Si-Clauses ?

Si-Clauses are used to express what would happen if something else were to happen. Sentences which contain two parts, one of which is is a SI clause, follow one of the following patterns: case 1       si + présent + futur case 2       si + imparfait + conditionnel présent case 3       si + plus-que-parfait + conditionnel passé

Examples

case1	S'il pleut demain, je resterai à la maison.
	(If it rains tomorrow, I'll stay at home.)
case2	S'il pleuvait, je resterais à la maison.
	(If it rained, I would stay at home.)
case3	S'il avait plu hier, je serais resté à la maison.
	(If it had rained yesterday, I would have stayed at home.)