I seem to hear someone knocking at the door,系动词seem后面加动词的时候也

i seem to hear someone knocking at the door,knocking为什么要加ing I hear someone knocking at the door.的同义句 Listen!I hear someone knocking at the door. seem 后面加 副词 还是 动词原形? Listen!I hear someone knocking at the door （同义句转换） Listen!Th 初中英语 Listen!I hear someone knocking at the door.(同一句转换） List 一道同义句转换题,1.Listen!I hear someone knocking at the door.转换 ：Li 烦请帮忙看看该选哪个,以及为什么这样选? 谢谢 I seem __ someone knocking at the do Listen,l hear someone knocking at the door的同义句 Listen,l hear someone knocking at the door的同义句 Listen!There seem to be为什么seem 的后面要加to seem是不是系动词?