Youcan contract should have to should've, could have to could've, and would have to would've in informal situations. That's why the slang terms coulda, shoulda, and woulda are also prevalent. But it's never correct to say could of, should of, and would of. Could Have Been vs. Would Have Been vs. Should Have Been Ihave to visit my grandmother. While by replacing them we still have a meaningful sentence, there is a difference in meaning . The sentence with ' should ' expresses something that is better to be done. The sentence with ' have to ' expresses something that is a must. Therefore, ' should ' and ' have to ' are not interchangeable . Youre right, there is a tense problem. "Should already have exist" should be "should already have existed."This is the past progressive (or past continuous) tense combined with a modal verb "should." The auxiliary "have" cannot be combined with the present tense form of a verb: it always takes a past participle. Whatshould've won in 2013: "Zero Dark Thirty" (Metascore: 95) Sony Pictures Home Entertainment. What won: "Argo" (Metascore: 86) If critics had the vote, Ben Affleck wouldn't have capped his Ifyou say "I suggested that she should have bought a car", this means that you suggested that she should (already) have bought a car (by the time you spoke). You may well have said to her, "You should have bought a car." But if you say "I suggested that she should buy a car", then the possibility of buying one was still open to her at the time Theformer NPP executive noted that the president's name and integrity should not have been brought into Kennedy Agyapong's conversation at all. .

should should be should have should have been