the police are looking for the thief这句话中be动词为何是are

the police are looking for the thief这句话中be动词为何是are The police _____ (be) looking for the thief. 1)the police are looking for the thief.(改被动语态） The police are looking for the lost boy 为什么是are呢 The police are looking for the robber everywhere.同义句 翻译the police are looking for the missing gisl The police are running a_____the thief. the police in washington were looking for a thief. 改同义句 Now the police are looking for the boy.Now the police a Look,the police are catching the man ,he is a thief.动词为什么用ar The police are trying to catch the thief. The police are looking for the missing child in the forest 为