They listen in to Radio Beijing every day .为什么中间要加个to

They listen in to Radio Beijing every day .为什么中间要加个to they often listen to ? radio in ? evening Try to listen to the radio in English every day.[改为否定句] They listen to the radio in the evening.__ __ they __ __in t She listens to the radio every day ,------ They enjoy to listen to the radio.哪里错? Jenny listen to the teacher in class every day.这句话对吗?listen是 They listen to the radio 变成现在进行时 They listen to the radio.(用yesterday morning变成一般过去时) radio.对listen to the radio提问 listen to radio 还是listen to the radio the_______________ (follow) day,they went to beijing