No one knows how it is supposed to work. -> present tense

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Have I assigned the tenses to the sentences correctly?
1. No one knows how it is supposed to work. -> present tense
2. No one knows how it shall work. -> present tense
3. No one knows how it should work. -> past tense
 

Matthew Wai

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I think 'is supposed to work' and 'should work' refer to the present while 'worked' refers to the past. I would not use 'shall work'.
 
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Ungifted

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Okay. Let me repeat all this.

1. No one knows how it is supposed to work. -> present tense
2. No one knows how it shall work. -> tense of no interest since the sentence itself is wrong
3. No one knows how it should work. -> present tense
 
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teechar

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Sentence #2 is not wrong! It's just that "will" is much more common than "shall".
 

Ungifted

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Okay. All once again.

1. No one knows how it is supposed to work. -> present tense
2. No one knows how it shall work. -> future tense, but uncommon
3. No one knows how it will work. -> future tense, common
4. No one knows how it should work. -> present tense
 
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