1、做定语:a difficult task一次很难的任务。
2、作表语:this task is difficult.这次任务很难。普通形容词都可以如上用。
3、句型:it is difficult for sb to do sth:做某事对某人来说很难.如:it is difficult for me to do the task。
4、名词是difficulty句型:have difficulty (in) doing sth。
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