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一、发生频率区别

always：一直，总是：100%

usually：：通常地：90%

normally/generally:一般地：80%

often:常常：70%

sometimes：有时：50%

occasionally：偶尔：30%

seldom：很少：10%

hardly ever：几乎不：5%

never：从不：0%

二、使用方法

be动词、助动词或情态动词之后 eg：He is often late for school

行为动词之前：eg: He usually gets up at six in the morning

* 为了强调可以放在be动词、助动词或情态动词之前：eg: he always is late

*sometimes位置灵活，句中句尾句末， eg：I go to the gym to run sometimes