1 . 除非
...wherever-(无论在哪里)anywhere-(在…任何地方)everywhere-(到处)3)条件状语从句if-(如果),(假如)unless-(除非),(如果不…),=if…not…4)原因状语从句because-(因为),侧重从句内容、since-(由于),(既然),侧重主句内容、as-(由.
2 . 如果不
chopstick筷子unless除非,如果不emperor皇帝
3 . 假如不
we will spend our holiday in the south unlesswe are busy ., 假如不忙 , 我们将在南方度假.
4 . 若不
unlessyou wear boots you may be bitted by snakes ., 若不穿靴子你可能被蛇咬.