did you find it very interesting to play the computer games?中为什么要用it而不用it's?
问题描述：
did you find it very interesting to play the computer games?中为什么要用it
而不用it's?
答
it 是形式主语，表述的内容是 play the computer games
当然你也可以这样表达did you find that it's very interesting to play the computer games?
答
it 在这里做形式宾语，代替后面的宾语，也避免句子出现头重脚轻的效果.而楼主你应该是想说为什么不用it is 吧，it's并不等于it is哦，it's的意思是它的.
答
it在这里是形式宾语 代替后面的
答
it作形式主语