I must do it. - I am obliged to do it., You must do it! - I strongly advise you to do it!, You mustn't do it. - You aren't allowed to do it., She has to do it. - She is obliged to do it., She doesn't have to do it. - It's not necessary for her to do it.,

must/mustn't - have to/don't have to

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?