[Grammar] was/were supposed to/going to

[Caesats]

Hi everyone
Was/ was were supposed to

can mean [that] what was expected didn't or won't happen.[examples:]

,I wasn't going to go to the party(but I guess I will)​

I wasn't supposed to go by myself (but I'll have to).

I want to know why it isn't:​

,I wasn't going to go to the party(but I guess I would)​

I wasn't supposed to go by myself (but I would have to） They are future in the past，not simple future:shock:
Here is the picture

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[Rover_KE]

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