The modals must, must not and need not have the same form regardless the subject. I need not play football. Someone must have broken into the house. For Example: I saw Cynthia crying a few minutes ago. People use "must have" when they have a pretty strong reason or evidence for thinking something. Examples: Must Have + Past P. My mother has arrived late. Might Have + Past P. Alex may have taken the wrong train. That said, must have been is used when you see some clear evidence and are sure that the thing you are going to talk about has actually happened, but you are still not 100% sure. May Have + Past P. We may have passed the math exam, but it was in French. Be that must have been or any other phrase in the English language. "must have": we believe the action definitely happened. Could Have + Past P. I’m sorry but, You could have played better. For example: I have to pay the bills because my wife is ill. = I have to play football.. In the negative form, must expresses a strict prohibition: You mustn’t smoke here. See examples of Must have in English. "She must have left the house by now; it’s nearly 11 o'clock." I may have missed the opportunity of a lifetime. (The negation of must means not allowed to.). Couldn’t Have … Unlike other verbs in English which usually adopt the verb “to do” as an auxiliary, “must” does not. / That mustn't have been Peter calling. Real sentences showing how to use Must have correctly. Here are some examples of 'must' in its forms and functions. If you want to say the sth. is unnecessary, use need not, not must not. We use "must have", "can't have" and "might have" in the same way as the present perfect - the action we are describing happened, or did not happen, in the past and is still true in the present. I might have accidentally picked up your keys instead of mine. B: They must have left already. Thinking about it now, I may have told him to meet us at 10am instead of 8am! I must stop smoking. 1. Examples: Criminals must be life-sentenced. must-have: [noun] something that is essential to have or obtain. ; I went to meet the doctor, but he was not at the clinic. Additionally, must expresses the speaker’s feelings, whereas have to expresses, above all, an impersonal idea. Notice how it changes depending on present, past and future time. Past That must have been Peter calling. Must Have Done (V3) Modal "must" has a meaning of necessity, many think that "must have V3" has the same meaning as "should have V3". It’s really bad for my health. She must have … Police have to arrest the criminals as soon as possible. I must play football. There is no ending with he/she/it. In English, “must” is used when we are talking about obligations. / That mustn't be Peter calling. For example, should a team have too many potential epics (i.e., high-level stories) for the next release of their product, they could use the MoSCoW method to select which epics are Must have, which Should have, and so on; the minimum viable product (or MVP) would be all those epics marked as Must have. Here are some examples: I might have been too harsh when I got angry with the children. She must have been in a traffic jam. Here are some examples: The lock is broken. Present That must be Peter calling. Explanation of the English phrase "(something) must have (done something)": You can make guesses about things that happened in the past with the phrase "must have ___": A: Where are Deanna and Jun? However; We use must when we talk about a strong possibility based on facts referring to the past. The receptionist said, “You have to wait, the doctor must be on the way.”; You must take a stand for yourself, or else you have to follow others command. Certainty. 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