英语构词法的形式答:例如:useful(有用的),meaningful(有意义的),careful(认真的),doubtful(怀疑的),successful(成功的),helpful(有助的) -ish表示“somewhat like”。例如:childish(幼稚的),foolish(愚蠢的),snobbish(势利眼的),Swedish(瑞典人),Turkish(土耳其人) -less表示“without”。例如:careless(粗心的),useless(无用的),mean...
...英语里有没有一个单词表示的意思是very effective/powerful tool...答:very effective tool= powerful tool.与 effective 含义相近的单词有:useful, impressive, efficient, sufficient, powerful, direct, potent, practical, competent, valid, compelling, active, adequate, forceful, dynamic, effectual, efficacious, able, capable, cogent.