What does Mike do on the farm?He milks cows.(milk) 迈克在农场做什么工作?给奶牛挤奶.
问一个人的工作,工作是一直在做的,要用一般现在时,第三人称单数do 变形为does.
Gao Shan put (put) the book on his head an hour ago.高山头顶着书有一个小时了.
an hour ago 表明是用过去时,put是不规则动词,过去式是put