I found ( )difficult to learn English grammar

I found ( )difficult to learn English grammar I found ____ difficult to learn English grammar. I found _____ difficult to english grammar. I found difficult to learn English grammar.A it Bthat Cit is I found ____ ____ to learn English grammar I found that it was frustrating to learn English grammar. I found ______ difficult to learn English well Another thing I found very difficult was English grammar I found very difficult was English grammar这句话对不对? I found English grammar dull and difficult.这句话对吗? I found it difficult to learn English well 同义句 __was difficu i found it difficult to learn english well哪个是宾语