long—length 长度

wide—width 宽度

high—height 高度

strong—strength力量

十、以-ic结尾的动词，应先把-ic变为-ick，再加ing或ed

picnic (picnicked, picnicking) 野餐

clinic

panic

十一、个别名词的复数拼写

Germans humans Romans

gulfs roofs cliffs handkerchiefs chief belief proof

heroes ，potatoes ，tomatoes

stomachs medium-media bacterium-bacteria

crisis-crises basis-bases analysis- analyses

criterion-criteria mouse-mice

species series means

十二、注意动词变名词时的拼写变化

succeed—success成功

pronounce—pronunciation 发音

explain—explanation解释

decide—decision 决定

enter—entrance进入

permit—permission 允许

refuse—refusal 拒绝

consider—consideration 考虑

discover—discovery 发现

bury—burial 埋葬

conclude—conclusion 得出结论

arrive—arrival 到达

weigh—weight 重量

十三、注意形容词变副词时的拼写变化