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May changes to might in subordinate clauses, when the verb in the main clause is in the past simple tense.
The conjunction that is never preceded by a comma.
Express a counterfactual (that didn't happen) condition by the past perfect and use the past conditional in the main clause. This use of the past perfect doesn't indicate a time but an impossible happening.
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.
If you begin with a verb referring to past time, keep the verb forms in the past. The same rule applies to tenses throughout a composition.