The plan was made at/before the moment of speking
This is a prediction with no/based on evidence
This is an offer/ a prediction based on evidence
The speaker first had the intention at/before the moment of speaking
This is a question about a future fact/suggestion

The plan was made before the moment of speaking 
This is a prediction based on evidence
This is a prediction based on evidence 
The speaker first had the intention before the moment of speaking 
This is a question about a future suggestion 

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