extent,extend,extension之间的关系好想是说谁是谁的名词或是动词

Question

extent,extend,extension之间的关系
好想是说谁是谁的名词或是动词

Answer 1

extent
名词 n.
1.广度,宽度;长度[U]
Standing on the top of the mountain,you can see the full extent of the forest.
站在山顶上,你可以看到森林的全貌.
2.程度;限度;范围[U][the S]
To a certain extent,I am responsible for the delay.
在一定程度上,我对拖延负有责任.
3.一大片(地区)[S]
extend
动词 v
延长,延伸;扩大,扩展
Can't you extend your visit for a few days?
你们访问的时间不能延长几天吗?
extension
名词 n.
1.伸展;伸长;扩大[U][(+of)]
the extension of our foreign trade
扩大我们的对外贸易
2.延长;延期;缓期[U][C]
We had hoped for the extension of the deadline to the end of the week.
我们曾希望把最后期限延至周末.
3.延长部分;扩大部分;增设部分[C]
We built an extension to our house.
我们扩建了我家的房屋.
补充extension是extend的名词形式.而extent只是在单词拼写上有些相像.