1. 不可数名词：
Furniture luggage clothing equipment poetry jewelry machinery weaponry scenery information knowledge evidence foliage health advertising
2.学科名词(不可数，不加冠词)：
mathematics economics statistics physics politics mechanics genetics geology geography chemistry philosophy biology history astronomy
3. 单复数特殊名词：
man/men woman/women tooth/teeth foot/feet goose/geese basis/bases analysis/analyses crisis/crises hypothesis/hypotheses axis/axes alga/algae larva/larvae fungus/fungi stimulus/stimuli datum/data bacterium/bacteria medium/media spectrum/spectra mouse/mice child/children phenomenon/phenomena
4.单复数同行 ：
aircraft spacecraft series species means sheep deer fish salmon trout carp starfish jellyfish shellfish walrus
5.可跟that同位从句：
observation， fact， belief， discovery， doubt， statement， conclusion， decision idea，evidence， hope， news， opinion， thought， rumor， explanation， truth。