-ity ' state, condition 名词词缀

productivity生产力；生产率, intensity, superiority

productive with adjectives ending in –able, -al, -ar

respectability, morality, brutality, equality, stupidity, familiarity, popularity

-ary' 具有。。。性质的 形容词词缀。

1. It is customary to give tip to waiter/waitress when you have dinner in an American restaurant.

2. They lack the most elementary sanitary(卫生的) facilities（设施）.

3. Chang’er is just an imaginary figure in Chinese fairy tales and is in fact in nonexistence.

4. Since he just arrived in Shanghai and the house price was too high for him to buy, he had no choice but rent a flat as his temporary residence.

5. The marriage must be voluntary, but in fact many people are the victims of forced marriages.

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