I find that it is great to do sth这句型对吗?需不需要that?

I find that it is great to do sth这句型对吗?需不需要that? 有没这个句型:think it adj to do 或 find that it is adj to do sth I find that it is important to do morning exercises I find it good to do sth ,it为什么不能换成that I find it hard to do that.I find it no good doing that. 请问是I find it difficult to do sth还是I find it is difficult to I find that it is difficult to do the work .句子正确吗? 宾语从句I find that it is important to do morning exercises .之后的 有Sb find it is adj to do sth 的句型么 这个句子对吗?I think that it is important to do your home works. 在I find it ＋adj.＋( far sb.) to do sth.句型中 it 后面可不可以加is?那I th I find that it is easy to answer the question.