= Present 2. Yes Is the above sentence right in using it ? He couldn’t enter the country. Can’t have + past participle We use ‘can’t have + past participle’ for things that we are sure did not happen in the past. She can't have driven there. You can’t/couldn’t have seen John last night. It was for adults only. I can’t have left my phone at work. Dreamed and dreamt are both acceptable past tense forms of "dream." That’s it. You phoned me when I was walking to my car. It must be in the car. It's easy to be fooled by the word "sneak": should the past tense be "snuck" or "sneaked"? The past tense word for shoe is shod, you can even look it up in a dictionary. I thought I saw Adnan this morning but it couldn't have been him – he's in Greece this week. SHIFT TO "COULD" I could speak Chinese when I was a kid. 1. He was in hospital. 1. SHIFT TO "COULD" This article explains its irregular history and which one to use. Use our search box to check present tense, present participle tense, past tense and past participle 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'. One can check verbs forms in different tenses. She didn’t even open the books. 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. You can’t have seen him this morning. The past tense of can't is couldn't. The past tense of has is had. Like in the present tense when we use “can’t” to express impossibility, “couldn’t” is used in the past to express the same. = Future: Also use: can general ability: 1. For isn't a verb and so doesn't have a past tense. I can't speak Swahili. = Past 3. 2. "Dreamed" follows the pattern of regular verbs, ending with "-ed" while "dreamt" is irregular. Examples: We couldn’t park in front of the entrance. Her car keys are still here. The past tense of get is got. Often the irregular or "strong" form of a word gives way and is replaced by the normalized form, … 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? Do this exercise to test your grammar again. The past tense of have is had. SHIFT TO "BE ABLE TO" I will be able to speak Chinese by the time I finish my course. What to Know. We couldn’t take the children to see the film. Had is already the past tense. He was with me all the time. 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. Grammar test 2 = Present 2. = Future: Negative Forms 1. = Past 3. suggests that many native speakers are a bit unsure about must as a past form. 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