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

[Ungifted]

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]

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'.

 

[Ungifted]

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

 

[teechar]

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

 

[Ungifted]

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

 

[teechar]

2. No one knows [now] how it shall work [in future].
3. No one knows [now] how it will work [in future].

.