这个英语要这么学就累死了。
最好的方法，是找些例子，连续多读读，写写。
既然你那么喜欢找诀窍，看看这么记忆中不中。
historic 结尾-刻，刻骨铭心的事件-极为重要
important in history; likely to be thought of as important at some time in the future
histori-cal -抠-抠历史上有什么,不管重不重要，忘记过去等于背叛-历史要抠抠。
下面还有些英文的解释，帮助学西学习
Have a look at these examples and think about what may be different between 'historical' and 'historic':
We'll spend the afternoon visiting the historical buildings in the old town.
And here are the steps from which the president made his historic announcement
Historic = Having importance in or influence on history
Historical = Of or relating to the character of history; Based on or concerned with events in history; Used in the past: historical costumes; historical weapons
Historic and historical have different usages, though their senses overlap. Historic refers to what is important in history: the historic first voyage to the moon. It is also used of what is famous or interesting because of its association with persons or events in history: a historic house. Historical refers to whatever existed in the past, whether regarded as important or not: a minor historical character. Historical also refers to anything concerned with history or the study of the past: a historical novel; historical discoveries. While these distinctions are useful, these words are often used interchangeably, as in historic times or historical times.
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