他正在工作 翻译成英语：He is at now.Work要加s或ing还是原型?

他正在工作 翻译成英语：He is at now.Work要加s或ing还是原型? 他正在工作 翻译成英语：He is at now.Work要加s或ing还是原型?介词+doing吧 他一岁了,翻译成英语时,year要加s吗 he is one year old He is busy at work.work可以加ing吗 有什么区别 请问,he Came at once 的came,he在前面要加s,还是Ing,一般he后加什么 he is后动词是加ing还是S He is at work now.同义句 英语句子中,when后面加原型还是ing 哪些单词后加动词原型,加ing加to加s或es 他的妈妈 翻译成英语是his mother还是he's mother? Tom is a good worker.It's so late now,he must be at work. have 后加原型还是ing?