How much time do you often spend____(watch)TV at the weekend?

问题描述:

How much time do you often spend____(watch)TV at the weekend?

watching
spend st doing sth
花费时间做...

watching

(on)watching
因为on是介词所以用ing形式,只不过省略了

watching
因为spend sth doing

watching
spend + time + (in) doing + something 花费时间做某事
(这里省略的是in 不是楼上的on)
你周末经常花多长时间看电视?