Is this ____looking for?This is ______looking for.
2个回答

Is this that you were looking for?This is what you are looking for.

首先第一个是个问句.还原成陈述句:

this is something that you were looking for.可以看出是对主句的宾语提问.同时主句的宾语是从句中作宾语.对something 提问就成了:is this that you were looking for?

第二句中是陈述句.主句中少宾语.必须要用what.同时作主句和定语从句中的宾语.