不及物动词是不能带宾语的 要带宾语就必须加介词 但有些不及物动词带了介词也不跟宾语的好像swimHe always sw

不及物动词不能直接跟宾语,但有的不及物动词根本就没有动作的对象,就比方说swim,它不像smile,可以说对看某人笑,smile at,所以说,He always swims in the river中的in the river并不是动作的对象,这就是个状语；He suffers.这句话单独去看确实是意思不确定,这需要根据上下文去理解,比如：He has just recovered from a severe flu,then there's something wrong with his stomach,he really suffered those days.