两码事.
1.在句子 Did you find it hard to learn English 中,it 充当形式宾语,后面 to learn English 做真正宾语
2.在句子 Did you find it was hard to learn English?中,it was hard to learn English是宾语从句,在其中,it 充当形式主语,to learn English 充当真正主语