every evening after work句中after后为什么跟动词原形?什么情况下after后跟动词原形?

work 是名词,意思是：工作时间,上班时间
after work 下班后
例句：He was going to the theatre after work.他下班后打算去看戏.这句话原句是every evening after work the man would come home and play with the little boy在此处work不能作动词么 我的意思是如果它是working 它会缺少成分么？谢谢这个 work 明显就是名词。可以 换成 working，working 是动名词。