when did you put the pizza in the oven.用do是对的,因为这句话里有实义动词put,所以问句中要靠助动词do来变化.
若句子中没有实义动词,那就一定有be动词.when are you putting the pizza in the oven？这个可以嘛不可以。因为这句话里有实义动词put，所以问句中要靠助动词do来变化。那能再请问一下什么时候是用when are you 。。。。。吗？when are you going to put the pizza in the oven这个算吗when are you going to put the pizza in the oven这个对。