Stephen _____(lie) on the bed while Nick _____(pay) computer games.

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Stephen _____(lie) on the bed while Nick _____(pay) computer games.
Stephen _____(lie) on the bed while Nick _____(pay) computer games.

Stephen _____(lie) on the bed while Nick _____(pay) computer games.
Stephen 【was lying】 on the bed while Nick 【was playing】 computer games.
while前后的两个分句表示两个动作同时进行.所以都用“过去进行时”.

Stephen _lay__(lie) on the bed while Nick were playing (play) computer games.