You can’t have seen him this morning. can't have / couldn't have We use can't have and couldn't have + past participle when we think it's not possible that something happened. = Future: Also use: can general ability: 1. The past tense of has is had. He didn’t have a visa. Dreamed and dreamt are both acceptable past tense forms of "dream." It's easy to be fooled by the word "sneak": should the past tense be "snuck" or "sneaked"? "Dreamed" follows the pattern of regular verbs, ending with "-ed" while "dreamt" is irregular. My question/doubt: Can couldn't be used to denote the past tense ? Hi, Sentence: "Sorry I couldn't come/came back to you.I was busy" The normal idiom is 'get back to you', meaning 'reply, speak to you again'. She can't have driven there. You phoned me when I was walking to my car. The past tense of get is got. Like in the present tense when we use “can’t” to express impossibility, “couldn’t” is used in the past to express the same. Grammar test 2 He was with me all the time. SHIFT TO "BE ABLE TO" I will be able to speak Chinese by the time I finish my course. We couldn’t take the children to see the film. I can’t have left my phone at work. Often the irregular or "strong" form of a word gives way and is replaced by the normalized form, … Had is already the past tense. That’s it. He couldn’t enter the country. SHIFT TO "COULD" I could speak Chinese when I was a kid. She didn’t even open the books. She can’t/couldn’t have passed the test. Yes Is the above sentence right in using it ? Examples: We couldn’t park in front of the entrance. PastTenses is a database of English verbs. 2. = Present 2. The past tense word for shoe is shod, you can even look it up in a dictionary. The past tense of can't is couldn't. It was for adults only. What to Know. You can’t/couldn’t have seen John last night. 1. This article explains its irregular history and which one to use. = Past 3. Do this exercise to test your grammar again. Can’t have + past participle We use ‘can’t have + past participle’ for things that we are sure did not happen in the past. 2. It must be in the car. 1. can’t have done We use can’t/couldn’t have + past participle to say that we are quite sure that something did NOT happen or was NOT true in the past. = Present 2. SHIFT TO "COULD" 3. Use our search box to check present tense, present participle tense, past tense and past participle tense … Her car keys are still here. For isn't a verb and so doesn't have a past tense. = Past 3. = Future: Negative Forms 1. The past tense of have is had. Interestingly though, although no-one seems to have a problem with using could as both a present and past tense form, the earlier ELU question Is “must” ever grammatical as a past tense verb? suggests that many native speakers are a bit unsure about must as a past form. I thought I saw Adnan this morning but it couldn't have been him – he's in Greece this week. I can't speak Swahili. 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