第1个回答 2010-08-11
Because he was so tired of learning, he studied English very difficult .
第2个回答 2010-08-11
Because he is tired of studying,he studies English very hard.
第3个回答 2010-08-11
Being tired of learning, it is a painful work for him to learning english.
第4个回答 2010-08-11
He has difficulties in English studying because he is boring with studying.
第5个回答 2010-08-15
He is fed up with learning,so he has difficulty in studying English.