第1个回答 2013-09-04
I found that learning is tiring.
I find it tiring to study. 描述事物用现在分词,描述人用过去分词,因此这两个句子都对。。
第2个回答 2013-09-04
I found that I'm tired of learning.
I found that learning is tiring.
第3个回答 2013-09-04
I found that learning is tiring.
I find it tiring to stidy.
第4个回答 2013-09-04
I find it tired to study.
第5个回答 2013-09-04
你说的这些都可以。
表达方式不一样而已!