Can the phrase 'in case' be likened to 'if' conditionals in the sense that the first two sentences indicate a subjunctive mood while the last two indicate indicative mood? Does the first sentence imply that the speaker knows that the listener had past knowledge about the topic while the second sentence implies that the speaker knows that the listener has knowledge, at present, of the topic, which makes the first sentence past unreal and the second sentence present unreal ? Does the third sentence imply that the speaker assumes that the listener have no knowledge of the topic in the past while the fourth sentence implies that the speaker assumes that the listener has no knowledge, at present, of the topic, which makes the third sentence past real and the fourth sentence present real ?
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AnonymousIn case you haven't realised, the use of prepositions in English is very complicated..