要根据具体情况,我以实义动词work 为例。 they work in a hospital.一般现在时,动词用原形情况,加用助动词do. they don't work in a hospital. do they work in a hospital ? they worked in a hospital.一般过去时,加助动词did. they did...
1 变一般疑问句时将助动词does/do/did提到句首,时态、语态的变化军再次出现时,实义动词变为原型。 eg:do you want some coffee? 2。便特殊疑问句时将助动词does/do/did提到特殊疑问词后,实义动词变为原型。 eg:what color do you like best? 3 变否定句时在实义动词前加doesn't/don't...