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The first word of a sentence must start with a capital letter. There are millions of ways to start a sentence!
No: it requires an object for the verb "open". It would be correct to say something like "We must not open burning packages." Yes, if it means "We must not open (our shop, for example) while it is on fire.
an open sentence is defined as one that contains "free variables," which are variable that have not been assigned a specific meaning. Because of this open sentences cannot be labeled as true or false, their status is "open. Any number that makes the open sentence true satisfies it. In general we would call these the solutions or solution set. I must state that there are many definitions in many books that all give slightly different answers to what an open sentence is.
A open sentence is an equation with one or more variables is an open sentence.
There is so little light in the night sky that you must open the aperture on your camera
Another type of an open sentence
"Open" is a verb in the sentence, "Tell Maxwell to open the door."
He asked her to open the door.(indirect sentence) He asked her:"Please, open the door" (direct sentence)
An expression has no equal sign but an open sentence does Ex:2+4=6 open sentence Ex:2x5 Expression
The board met in secret, disregarding the law that states that all board meetings must be open to members.
An open sentence that contains the symbol greater than? Ans: y2 + 5y > 12 ( y is real) is one such open sentence.
There is no open compound in your question/sentence. An open compound word is a compound word with a space in it, e.g. hang out