It's hard to keep the house clean with tree kids .为什么不用cleaning 什么时候用加ing的呢

it's hard to it's hard to stand ( )it's hard to stand ( ) A .to be keep to stand B .to keep to stand C .keeping standing D .to keep to be stood And it's so hard to say goodbye But yesterdays gone we gotta keep moving on it's easy to open a shop,but hard to keep it always open 会的帮下, it's hard to tell~ “It's hard to die. 谁知道这是Westlife的什么歌的歌词it s easy to.it s hard to keep thing歌词有点错误了，是it's easy to fool around it;s harder to keep the faith he finds it hard to keep it under control翻译 There's a lot of details to remember,i have a hard time to keep it all straight.这里的keep it all straight是什么意思? It's hard to keep the room___with two childrenA.cleaning B.clean C.cleaned D.to clean It's hard to keep the house clean with tree kids .为什么不用cleaning 什么时候用加ing的呢 It's hard to comments to me. it's good to keep the it's hard to make living It's hard to die怎么解释? It's hard to study English. 有没有It's hard to me it's very hard to p___everyone