Be that must have been or any other phrase in the English language. (The negation of must means not allowed to.). 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. In English, “must” is used when we are talking about obligations. 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. I need not play football. Here are some examples of 'must' in its forms and functions. Real sentences showing how to use Must have correctly. 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. For Example: I saw Cynthia crying a few minutes ago. 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". Additionally, must expresses the speaker’s feelings, whereas have to expresses, above all, an impersonal idea. However; We use must when we talk about a strong possibility based on facts referring to the past. Examples: "She must have left the house by now; it’s nearly 11 o'clock." The use of must, must not (mustn't) and need not (needn't). People use "must have" when they have a pretty strong reason or evidence for thinking something. She must have been in a traffic jam. Here are some examples: The lock is broken. There is no ending with he/she/it. May Have + Past P. We may have passed the math exam, but it was in French. Certainty. Criminals must be life-sentenced. Present That must be Peter calling. I may have missed the opportunity of a lifetime. In fact, to create the interrogative form of “must”, all we have to do is invert the subject and “must” and our interrogative is formed. It’s really bad for my health. 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? Couldn’t Have … See examples of Must have in English. ; I went to meet the doctor, but he was not at the clinic. If you want to say the sth. Notice how it changes depending on present, past and future time. is unnecessary, use need not, not must not. Past That must have been 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. I must stop smoking. = I have to play football.. She must have … / That mustn't have been Peter calling. Someone must have broken into the house. Police have to arrest the criminals as soon as possible. Thinking about it now, I may have told him to meet us at 10am instead of 8am! I must play football. must-have: [noun] something that is essential to have or obtain. B: They must have left already. The modals must, must not and need not have the same form regardless the subject. Examples: Must Have + Past P. My mother has arrived late. / That mustn't be Peter calling. In the negative form, must expresses a strict prohibition: You mustn’t smoke here. Could Have + Past P. I’m sorry but, You could have played better. "must have": we believe the action definitely happened. Might Have + Past P. Alex may have taken the wrong train. For example: I have to pay the bills because my wife is ill. I might have accidentally picked up your keys instead of mine. 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