2019-08-12 15:59:37
可数名词边复数,有规则变化,也有不规则变化。具体如何变,请学习咱们的课程内容。
这里,咱们要说说具有希腊或拉丁词根的可数名词变复数的规则:
1. -us词根结尾的名词变复数,把-us改为-i
Singular | Plural |
focus | foci / focuses |
radius | radii / radiuses |
fungus | fungi |
nucleus | nuclei |
cactus | cacti |
alumnus | alumni |
octopus | octopi / octopuses |
2. -is词根结尾的名词变复数,把-is改为-es
Singular | Plural |
axis | axes |
analysis | analyses |
crisis | crises |
thesis | theses |
basis | bases |
diagnosis | diagnoses |
ellipsis | ellipses |
hypothesis | hypotheses |
parenthesis | parentheses |
synthesis | syntheses |
3. -um词根结尾的名词变复数,把-um改为-a
Singular | Plural |
bacterium | bacteria |
curriculum | curricula |
datum | data |
medium | media |
4. -on词根结尾的名词变复数,把-on改为-a
Singular | Plural |
phenomenon | phenomena |
criterion | criteria |
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