the verb imagine means 'to form a mental image of; make a mental picture or concept of' and it is used to describe a process of thinking about something that does not exist or that is not real. It is a transitive verb, which means it takes an object, such as when someone 'imagines a better future'.
the rules and use cases associated with this word are that it is typically used in the present tense. For example, 'I imagine you want a break after all that studying'. It can also be used in past and future tenses.
1. 'He often imagines what his life would be like if he had made different decisions.'
2. 'I imagine the next version of this phone will be even better.'
3. 'She can’t help but imagine what he is doing right now.'
Use this verb to describe the creative process of imagining something. Also, keep in mind that this verb is used to describe a futuristic act, so it might feel wrong to use it when describing actions in the past.