a. 不常的, 稀少的ad. 很少, 不常相关词组: not seldom seldom if ever seldom or never

◆记忆方法一：
谐音：萨拉姆 很少提起萨拉姆。
◆记忆方法二：
分析：sel——卖（sell）的近似拼写；d——“到”的拼音首字母；om——“欧美”的拼音
首字母。
记忆：这些产品是很少卖到欧美地区的。

◆记忆方法三：
联想方式：sel—色拉 do—做 m—麦当劳
记忆方法：麦当劳很少做色拉

• 陈述句中含seldom等否定词的反意疑问句
  
  陈述句中含seldom等否定词的反意疑问句
  
  当陈述句部分含有seldom(=not often不常), hardly(=almost not几乎不), few(=not many很少), little(=not much一点儿), never(从不，永不)等这些本身具有否定意义的词时，简略问句部分用肯定式。如：
  Youseldom play tennis, do you? 你很少打网球，对吧?
  You’venever been in Hong Kong, have you? 你从没来过香港，对吧?
  He has few friends here, does he? 他在这儿几乎没什么朋友，是吗？
  He knowslittle about it, does he? 他对此事几乎一无所知，是吗?
  注：但陈述句部分含有像dislike, unfair, fearless之类由否定的前缀或后缀的否定词时，简略问句部分仍用否不定期式。如：
  Some people dislike big cities, don’t they? 有些人不喜欢大城市

often/usually/always/frequently/seldom/never
记忆：
1. often [ 5C(:)fn, 5C:ftEn ] adv. 常常, 经常 How often do you go to your parents?你多久去看父母一次？
2. usually [5ju:VJElI] adv. 通常, 大抵 We usually visit our parents every weekend.我们常常每个周末去看望父母。
3. always [ 5C:lwEz, 5C:lweiz ] adv. 总是, 永远, 始终 注意：always 与not 用 在同一句中时为部分否定: 并非总是 They are not always kind to their customers. 他们对顾客并非总是很好。
4. frequently [5fri:kwEntlI] adv. 常常, 频繁地 Such an attack took place frequently.这样的攻击频频发生。
5. seldom [ 5seldEm ] adv. 很少, 不常 Seldom does he have sports, which is not good for his health. 他很少运动，这对他健康不好。
6. never [ 5nevE ] adv. 决不, 从未 I will never see him if he misses the appointment again this evening.如果他今晚再次失约，我将不再见他。
另类阅读：
Lin is such a good boy: he never kills small animals, seldom tells a lie, usually/often helps with the housework, and is ready to help others. He is frequently praised by his teachers and classmates alike.