seen 和 done 都是完成式的,也就是说,它们表示过去,并且这个有持续性的动作已做完(或到现在已做完).现在完成式的信号词为have(注意主语是不是第三人称单数,是则用has),过去完成式的信号词为had.而seen是see(看)的变形,因此可以造句得: 1 I/You/We/They have/had seen ______(名词Harry Potter).2 Have/Had I/you/we/they seen_____(名词)?3 He/She/It/人名has/had seen _____(名词).4 Has/Had he/she/it/人名 seen_____(名词)? done是do(做)的变形,它的造句与seen一样,只须将seen替换为done就可以了后面两个是原形,也就是不加化装的词.句子中出现原形只有在to,will及情态动词后面或祈使句中造句得:1 I like(want/prefer...)to/will/can(must/should...)play_____(名词the guitar/football)2 I like(want/prefer...)to/will/can(must/should...)learn (名词English).3 Don't play the drum so loudly!4 Learn your subject by heart如果对我的回答满意的话,并且愿意与我交流英语的话,请联系我:QQ 406256520
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