“It is hard to keep the house___(clean) with three kids.”中应填clean,为什么要说出“keep+sb/sth+adj.”和“keep+sb/sth+doing”到底有什么区别,具体点

It is easy to open a shop but hard to keep it open.什么? It is hard to it is (u ) to keep working so hard,it doesn't work at all It is hard to keep the house ___with therr kids.a.cleaningb.to cleanc.cleanedd.clean but it is hard to keep the tears from my eyes,这句话咋翻? It is very hard to keep the b__ on the ice roads It is hard to wait It is hard to please It is hard to select! he finds it hard to keep it under control翻译 i feel it hard to keep up with my classmates的句子结构 it后不应该有is吗 i find it hard to keep a dog hard 是形容词,为什么前面没有be?不是 it is adj to do it is hard for only one girl to keep the classroom to clean every day 为什么用to clean还有keep的用法 Thought it is raining hard,the workers keep _ (work) He finds it hard to keep pace with the development in physics.He finds that it is hard to keep pace with the development in physics.这两句有什么区别,有没语法错误? It is hard to study English g______well. it is time to study hard! why it is so hard to do