这We must take our turn at work这句话中的 our turn 要加 s turns

We must take our turn at work这句话中的 our turn 要加 s turns 这We must take our turn at work这句话中的 our turn 要加 s turns 的We must take our turn at work这句话中的 our turn 要加 s turns take turns to do sth 这个句型里“turn”为什么要加S啊? take turns doing sth 这个句型里“turn”为什么要加S啊 tree turns green 为什么turn要加s take turn还是take turns? take one's turns to do sth 和 It'one's turn to do sth 这两个句子对吗 We must __D___ our turn a long time to pay for what we buy.A "We should work on our moodiness." 这句话中的“work on”是某个词组吗? 是take turn还是take turns? take turns 和 take turn 的区别