由于老师的帮助,我将能准确地讲英语。
may (might) 可以, 表示说话人同意,许可或请求对方许可。
You may take the book home.
你可以把书带回家去.
May I come in?
我可以进来吗?
May I use your dictionary?
我可以用你的词典吗?
You may put on more clothes.
你可以多穿点衣服.
He said he might lend us some money.
他说他可以借给我们一些钱。
may 否定式为 may not, 缩写形式是 mayn't.
might 是may 的过去式, 有两种用法, 一种表示过去式，一种表示虚拟语气, 使语气更加委婉, 客气或对可能性的怀疑。
He told me he might be here on time.
他说他能按时间来。
Might I borrow some money now.
我可以借点钱吗?
He might be alive.
他可能还活着。
Must 必须,应该,一定,准是, 表示说话人认为有必要做某事, 命令, 要求别人做某事以及对事物的推测。
must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。
I must finish my work today.
我今天必须完成我的工作。
You mustn't work all the time.
你不能老是工作。
Must I return the book tomorrow?
我必须明天还书吗?
After such a long walk, you must be tired.
走了这么长的路,你一定困了。
He must be the man I am looking for.
他一定是我要找的人。
He had to go because of somebody's calling
him that day.
那天他要走是因为有人叫他。
must + have + 过去分词,表示现在对过去事物的推测。
He must have told my parents about it.
他一定把这件事情告诉我父母亲了。
He must have received my letter now.
他现在一定收到我的信了。
It's six o'clock already, we must have been late again.