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Can changes to could in subordinate clauses, when the verb in the main clause is in the past simple tense.
As a rule, verbs denoting a state rather than an act have no continuous forms, like understand, know, believe, like, love, belong, prefer, consist, mean, hear, see, etc.
Use the present tense of wish to express a present meaning, followed by a that clause containing a past tense.
The infinitive simply names an action without reference to person, number or time. Therefore, it can't make sense without the help of a finite verb