have to,不得不,必须,表示客观条件只能如此, 而must 则表示主观思想必须。
will (would)决心,愿望。 would 为 will 的过去式, 可用于各人称。
I'll do my best to catch up with them. 我要尽全力赶上他们。
I'll never do it again, that's the last time. 我再不会做那件事情了,这是最后一次。
He said he would help me. 他说他会帮助我。
will, would用于疑问句表示说话人向对方提出请求或询问,用 would 比 will 更婉转,客气。
It's hot. Will you open the windows? 天气太热了,你能打开窗户吗?
Will you help me to work it out? 你能帮我解这道题吗?
Would you like some coffee? 给你来点咖啡怎样?
提问者对于答案的评价:谢谢