Why use "shall" for "am" inside

[Taras]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #116 "Future Tenses", question 3

I ......... simply wait until she comes back.

(a) was
(b) am
(c) shall
(d) do

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #116 "Future Tenses", answer 3

I shall simply wait until she comes back.

Correct answer: (c) shall

Your answer was: incorrect
I am simply wait until she comes back.
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why use shall for am inside

Taras

[Alan]

Hi Taras,

You need to use shall here to indicate a future sense. You cannot use am with wait because it would have to be I am waiting.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Snoopy_Blah_Blah]

Can I use will instead of shall when taking exam?

I will simply wait until she comes back.

Or is "I will/we will" used only in spoken English and will be a mistake on exam?

[Mister Micawber]

.
Yes, 'will' will be fine. In fact, I would be surprised to find that 'will/shall' is still tested-- it is a use that is fading away
.
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Native English teacher at Mister Micawber's