be allowed to (school), be advisable (traveling), needn't (online shopping), (have) got to (healthcare), it's up to you whether (air travel), have no choice but (traffic), be free to (work), be obliged (getting visas), be under (no) obligation (work), be expected to (English classes)

adv modals

由
列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?