1 . not necessarily
...lways(不總是,不一定),not often(不經常),not altogether(不全是),not necessarily(未必)等。
2 . may not
A brother may not be a friend , but a friend will always be a brother ., 兄弟未必是朋友 , 而朋友總是兄弟.
3 . hardly
1446. extremely ad. 極端地,非常1447. hardly ad. 幾乎不,未必1448. placement n. 布局
4 . not always
The rich are not always happy ., 富人未必就幸福.