Apr 12, 2016 · You must have done something = It’s obvious that you did it You should have not thrown your cigarette into a location where explosives were stored. You should not have thrown your cigarette into a location where explosives were stored. You must have not thrown your cigarette into a location where explosives were stored.

Mar 6, 2007 · "The Livi striker must have knew it wasn't his day less than a minute into the second-half when he somehow managed to hit the post from only three yards out with the goal at his mercy." It is rare in both versions of English (AE and BE), but it …

Nov 9, 2011 · You should have received a confirmation email implies: Under normal procedures, everyone receives a confirmation email. Assuming everything is happening in accordance with the normal procedures, you will have received a confirmation email. and You must have received a confirmation email

Jan 26, 2016 · A modal (such as must) is followed by the bare infinitive form of a verb. In "I must do", do is a bare infinitive verb. In "I must have done", have done is a past bare infinitive verb. The past infinitive form is not equivalent to the Present Perfect tense. You can say She must have done it yesterday , but you cannot say She has done it yesterday .

Mar 5, 2010 · Must have is a correct form, so it's hard to think must not have is wrong. However, most people prefer other ways of saying that, I think. Must have not is possible, of course - meaning cannot have - so maybe it's just a matter of word order.

Oct 15, 2014 · It's simply related to the tense of the verb. "That must be" is present, and can be used for something that has already happened, or that might happened. "Must have been" is past, and cannot be used for something that might happen. PAST - I feel off when on stage yesterday. - Oh, that must be embarrassing/Oh, that must have been embarrassing ...

Oct 24, 2012 · We can use must have to to say that we conclude something based on what we know about a present situation and must have had to to conclude something about a past situation: [...] - John wasn't at home when I went round. He must have had to go out out unexpectedly. (Advanced Grammar in Use 2nd edition, Martin Hewings) John wasn't at home …

May 7, 2014 · When we use "must have", we are saying this how we think she probably did feel, given the circumstances. -- It is an assumption about a real event (the purse did get stolen). When we say "might have", we are saying this is how she probably would have felt in circumstances that could have occurred but did not occur.

Feb 7, 2016 · With has a meaning = and (I have confused you and John, can mean I have confused you with John.) For indicates a purpose, or to the benefit or detriment of something. I have confused you for a reason; I have confused you for my advantage: in neither of these cases, have you mistaken the person with a reason or an advantage.

Apr 3, 2012 · I would also use mustn't she? and haven't you? - so these would the standard tags that follow the rules. I don't know whether you're think of imperatives, where the tags are a little different: