No. In hockey, you can substitute without a stoppage in play. In football (american soccer) you need to wait for play to stop.
This refers to when the goalie takes possession of the Puck, generally eliciting a whistle from the referee and a stoppage of play, hence the phrase "freeze the Puck!"
Players can substitute in either during a stoppage in play or on the fly.
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After a stoppage of play that is where the play starts up again. It is called a face-off
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It is when the players change lines (from bench to ice) during gameplay, not during a stoppage.
Yes you can. However, only in fights mostly.
You can change as many times as you want in a hockey game. You can either make a line change on the fly while the play is going on, or in a stoppage.
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