it is hard to be in a crowded bus on commuting.其中去掉to be可以吗 为什么要加 to be

It is hard to be a soldier. It is hard to it is hard to be in a crowded bus on commuting.其中去掉to be可以吗 为什么要加 to be Generally speaking,being hard-working is just what it takes you to be successful in your career And it is hard to plant flowers in the rain. and it is hard to plant flowers in the rain It is awfully easy to be hard-boiled about everything in the daytime,but at night it is another thing.求翻译 It is hard to wait It is hard to please It is hard to select! It is generally believed that being hard-working is just_____it takes us to be successful in our career .A.that B.whether C.what D.how it is hard to imagine what life would be like without it是什么从句 It's hard to be a man. It's hard to b____ that it is so warm in Australia. I think it hard to fall asleep in night.请问it后为什么不加is. I think it hard to fall asleep in night.为什么it后面没有is 常用句型it can be hard to do...和it is hard to do 有何区别?两个都是啥意思?在意思上是否一样?it can hard 行么?为何家be hard是啥词性? 求原文,in general,it is hard to spend enough time in both conerntrating.