我们必须学好英语 We must learn English ; We need to learn English

为了工作必须学好英语 Job must learn English ; Must learn English to work

所以我们必须学好英语 So we must learn English

我们俩都必须学好英语 We both must learn English

所以我必须学好英语 So I must learn English

我必须把英语学好 I must learn English ; I had learn English well

我必须好好学英语 I had to learn English

我们必须要学好英语 We need to learn English

我必须好好好学习英语 Good I must learn English