Subject + 赛
The verb 赛 (sài) means 'to compete' or 'to race' and is used to describe participating in competitive activities. It is frequently found in verb-object compounds and can function as both a noun and a verb. For example, 常规赛 (regular season competition) uses 赛 in a nominal sense.
咱们赛一场,看谁跑得快。
Zánmen sài yì chǎng, kàn shéi pǎo de kuài.
Let's have a race and see who runs faster.
他从小就喜欢跟别人赛跑。
Tā cóng xiǎo jiù xǐhuan gēn biéren sài pǎo.
He has liked racing against others since he was little.
我们来赛一下,看谁先做完。
Wǒmen lái sài yíxià, kàn shéi xiān zuò wán.
Let's have a contest and see who finishes first.