B1 old-fashioned used instead of "will" when the subject is "I" or "we"(用于在主语为 I 或 we 时替代 will)
More examples
Unless the money is returned, we shall shortly be contacting our legal department.
I can't afford a lawyer so I shall defend myself.
I did meet him once and it was an experience I shall never forget.
I shall list my objections to the plan in ascending order of importance.
When we receive your instructions we shall act accordingly.
A2 formal in US used, with "I" or "we", to make a suggestion(与 I 或 we 连用,表示建议)
More examples
Are you comfortable or shall I turn the heat down?
"So we'll meet at 5.30, shall we?" "Agreed ."
I'll leave you to get on then, shall I?
Since it's such a nice day, shall we eat outside?
What about Lola - shall we invite her?
formal or old-fashioned used to say that something certainly will or must happen, or that you are determined that something will happen(表示某事肯定或必须发生,或表示决心)
More examples
Don't worry - I shall make sure he comes!
I shall make sure she knows.
Very well then, I shall do it myself!
If he won't do it, I shall do it and then there'll be trouble!
I shall speak to her later.
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