always：
Peter is always getting into trouble.
彼得总是遇到麻烦。
usually：
They usually get their work done on time.
他们通常按时完成工作。
frequently：
My sister frequently goes shopping in Seattle.
我妹妹经常去西雅图购物。
rarely：
They rarely ask questions about the homework.
关于家庭作业他们很少提问。
频率由高到低：
always：总是
He always does his homework.
他总是完成作业。
usually：通常
They usually complete the work on time.
他们通常按时完成工作。
often：经常
I often watch movies online.
我经常在网上看电影。
sometimes：有时候
Jack sometimes comes over for dinner.
杰克有时会过来吃饭。
occasionally：偶尔
She occasionally asks a question.
她偶尔会问一个问题。
rarely：很少
They rarely have any homework.
他们很少有作业要做。
never：从不
I never complain at work.
我在工作中从不抱怨。
那么，频率副词在句中应该放在什么位置呢？我们来看看下面的规则：
如果句子中有一个动词（例如没有助动词），我们通常将副词放在句子的中间，即在主语之后，动词之前：
subject / adverb / verb / predicate
主语/副词/动词/ 谓语
Tom usually goes to work by car.
汤姆经常开车去上班。
Mary often asks me for help.
玛丽经常请我帮忙。
频率副词通常放在“be”动词之后：
subject /be verb / adverb / predicate
主语/be动词/副词/谓语
Tom is often late.
汤姆经常迟到。
Anne isn't usually sick.
安妮通常不怎么生病。
Peter isn't always right.
彼得并不总是对的。
如果我们将频率副词放在句子的开头或结尾表示强调，则情况并非如此。而且此规则也不适用于简短回答：
Is she usually on time?
她通常准时吗？
Tell her not to be late.
告诉她不要迟到。
Yes, she usually is.
是的，她通常是。
She never is.
她从来不。
如果句子中有多个动词（例如助动词），我们通常将频率副词放在第一个动词之后：
subject / helping verb or modal / adverb / main verb / predicate
主语/助动词或情态动词/副词/主动词/谓语
I can never forget his name.
我从来都不会忘记他的名字。
Anne doesn't usually smoke.
安妮通常不抽烟。
The children have often complained about the playground facilities.
孩子们经常抱怨游乐场的设施。
例外：
在含有“have to”的句子中，频率副词位于所有动词之前：
subject / adverb / have to / main verb / predicate
主语/副词/have to/主动词/谓语
We often have to wait for the bus.
我们经常要等公共汽车。
She never has to do any housework.
她从不做任何家务。
为了表示强调，我们可以将频率副词放在句子的开头或结尾。
首先，把它放在最后是很少见的。我们通常只在我们忘记把它放在开头时才把它放在结尾。
adverb / subject / main verb / predicate
副词/主语/主动词/谓语
Sometimes we go to school by bus.
有时候我们乘公共汽车上学。
Often he waits for her after class.
他经常在课后等她。
subject / main verb / predicate / adverb
主语/主动词/谓语/副词
We go to school by bus sometimes.
我们有时乘公共汽车去学校。
They like to watch TV often.
他们经常喜欢看电视。
例外情况：
“Always” 不能放在句子的开头或结尾。
“Never”,“seldom”,“rarely”不能放在句子结尾。他们只用于“陈述”的句子开头。然后他们必须遵循疑问句的词序：
Never has there been a better time to overcome our differences.
从未有过比这更好的时机来克服我们的分歧。
Rarely do we have an opportunity like this.
我们很少有这样的机会。
在疑问句中使用频率副词时，请将副词放在主动词之前：
auxiliary verb / subject / adverb / main verb / predicate
助动词/主语/副词/主动词/谓语
Do you often go to the cinema?
你常去电影院吗？
Do they usually come late to class?
他们经常上课迟到吗？
例外：
“Never”,“seldom”,“rarely”以及带有否定含义的其他频率副词通常不会在疑问句中使用。
当在否定句中使用频率副词时，请将频率副词放在主动词之前：
Subject / helping verb / adverb / main verb / predicate
主语/助动词/副词/主动词/谓语
They don't often go to the cinema.
他们不经常去电影院。
Peter doesn't normally want to come with us.
彼得通常不想和我们一起来。
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