L'imparfait The imperfect is used when making a description or talking about an ongoing action. The imperfect has its own set of endings, used for both l'imparfait and le conditionnel. To change a verb to the imperfect, use the 'nous' form and drop the 'ons', adding the appropriate l'imparfait ending. Imperfect endings:
	ais ais ait	ions iez aient

Example (with l'imparfait and passé composé):
	He was drinking a coffee when a roof tile fell on his head. in l'imparfait... Il buvait un café quand une tuile est tombée sur sa tête!

Le conditionnel Le conditionnel is used when describing an action that will occur under certain conditions. For example, If I were driving, I would eat. The 'if' part of the sentence is written in the imperfect tense, and the action uses le conditionnel. To change a verb to le conditionnel, simply add the appropriate imperfect ending to the infinitive (or the freaky fourteen irregular verb stem). Example (with l'imparfait and le conditionnel):

Si je conduisais, je mangerais.