conjunction
Definition: At (or as soon as) that time that; at the (or any and every) time that; if.
Example: A player wins when [as soon as, or at any time that, if] she has four cards of the same suit.
Definition: During the time that; at the time of the action of the following clause or participle phrase.
Example: Be careful when crossing the street.
Definition: At what time; at which time.
Example: I am here till Friday, when [i.e. at which time] I leave for Senegal.
Definition: Since; given the fact that; considering that.
Example: I don’t see the point of putting up Christmas decorations when I am the only person who is going to see them.
Definition: Whereas; although; at the same time as; in spite of the fact that.
Example: He keeps changing things when the existing system works perfectly well.