i find it's useful to learn English.为什么可以改成i find it useful

i find it's useful to learn English.为什么可以改成i find it useful 将I find it is useful to learn English well. 将“I find it is useful to learn English well"转换成同义句"I find -- 1 I find it useful _____(learn) English well. I find it useful to learn English well It is so hard to lear I find that it is useful to learn English.it是形式主语, 几个英语问题句型转换i find it is useful to learn English well.（改为简单句）i I find it's important to learn English .可以等于I find it import I find English()useful language.We must learn it well．(在线等) I find it very useful tolearn English well 同意句 I find it to learn English. I FIND IT IMPORTANT TO LEARN ENGLISH.