sb. who is doing sth.能不能省略“who is”？

变为sb. doing sth.？
比如 There are four women ( ) in this restaurant. (cook)
括号中能不能填cooking？还是只能填cooks?

楼上误人子弟……从句中关联词作宾语时才能只省略关联词

从句中关联词作主语时，要省略只能主语（即关联词）和谓语（be动词）一起省略，省略后可理解为现在分词作定语修饰sb.

过去分词也可以
sb. done sth.
当然意思不一样

但是从句中谓语不是be动词的话就不能省略

可以，不去掉它们，是定语从句。去掉它们就是非谓语动词做定语了 举个例子吧： The boy who is playing basketball is my brother.意思是：打篮球的那个男孩是我弟弟。可以改成： The boy playing basketball is my brother.意思完全相同

there： there is a dog catching a cat in the garden . there's a man sitting behind the bus-stop. 公共汽车站后边坐着一个男人。 stop : i only just managed to stop myself from shouting at him. 我极力控制住自己没对他喊叫起来。 you can't stop our going/us (from) going if we want to. 假若我们要去, 你是阻止不了的.