比较级：more difficult更难;难的;更困难;较难;更加困难
最高级：most difficult最难;最困难;最艰难
由于difficult是多音节词，所以变化形式要在前面加more/most
例句：t
1、I found English much more difficult to learn.
我发现英语难学得多。t
2、You have just do the most difficult task on the system.
您已经完成了系统上最困难的任务。t
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