he is a difficult man to please.这句话中的不定式在句子中充当什么成分?

when he is in a difficult situation,he is always asking for help.为什么有a Waht a b____ boy he is!He can work out the difficult problem. he is a ___(able) boy .It is difficult forhim to swim quickly It is a little difficult to c_____ someone when he or she is excited. With a lot of difficult problems< >,he is having a hard time. Soccer is a difficult sport. is------difficult to learn English well?A.this B.that C.he D.it Is （ ） difficult to learn English well?A.this B.that C.he He is in a difficult situation as all the public opinions are ________ him. he is in a difficult s___.let's help him.要快呀 It is a difficult task.A_____,he finished it on time 英语翻译Despite the fact the he is just a kid,he worked out a difficult math problem. Greek is a language I found__to learn.A.is difficult B.it is difficult C.it difficult D.difficult. Children as he is ,he can answer these difficult questions. when a man is worrying about someing,it is difficult for him to eat anything because he has l__ appetite. I think science is( )A real difficult Breally difficult语法 ____,he can not work out the difficult problemA a clever boy as he is B Clever boy as he is 这是什么结构? difficult is not difficult