Hi, there Let's suppose I am writing a text about language verb aspects and tenses. Then I want to say that, even though verbs can morphologically or syntactically indicate a wide range of ideas (called here “aspects”) in many languages (habitual aspect, perfect aspect, etc), these aspects all follow some kind of logic and don’t randomly refer to any given concept in the outside world. They can refer to the completeness of an event, or to whether this event happened a long time ago or recently, or even if the event occurred to the speaker, the listener or to a third person in the discourse, but they will never refer to such random concepts as whether the event happened downriver or upriver or at which height above sea level the event occurred So, let's suppose I write the following phrase: "(...) For example, there must be no language in the world that expresses, on its list of grammatical patterns, the expectation that verbs should indicate the height above sea level for a event described." I'd like to know if I can use "there MUST be no..." to mean "it is very unlikely that there is...". Can I use "must" to indicate possibility in this case? If not, could I say "There SHOULD be no.." to indicate that it is unlikely?... And another thing: would it sound odd to say "height above sea level for a event described", with "described" after "event"? Thank you very much for your help!