flee
1.flee是现在式，过去式是fled，过去分词也是fled，现在分词是fleeing。但flee和fleeing在英国很少用，被fly和flying代替。例如：Samuel fled yesterday. Samuel has fled. Samuel will fly tonight. （不用flee）Samuel is flying. （不用fleeing）
2.Samuel has fled和Samuel is fled两句意思相同。第二句里的fled是不及物动词的过去分词用作形容词。
3.Samuel fled the country last year和Samuel fled from the country last year两句意思相同。
