Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

I've heard people say 'be king' (as in 'I can't wait to be king') in movies and TV. Why don't they say 'be a king'? Which is correct?.
Since 'a king' uses an indefinite article, it suggests that he may become any one of a number of kings. In most cases where a person may become king, there is only one king in the political structure he inhabits. For instance, if he is in the line of succession for the English throne, he probably cannot become king of France or Denmark without marrying into that royal family. The equivalent phrase to 'I can't wait to be king' would use a definite article - it could be rephrased as 'I can't wait to be the king', since there is only one kingship he is eligible to accede to.

The meaning of Polish 'doing something on knees' or 'on a knee' is completely different than English. It is rather a metaphor to a student who instead of doing his homework properly at the home, he did it in hurry, supported his notebook on knees and did it in a short break between classes. In other words it means doing something in hurry, usually resulting in poor quality and unsophisticated enough. Some usage: Who designed this building? Looks like some architect 'made it on a knee'... Or nowadays according to software engineering: There are lots of bugs in this application! They came short on deadlines and 'wrote it on their knees' even without unit tests... My question is, is there an English equivalent (in idiom or phrase) which preserves this meaning better? Edit After reading some answers I realized that my examples were a little bit misleading. In reality, the phrase does not carry itself any negative connotations about the 'author'. Rather poor quality of his job results. The only negative connotations about author we can only deduce from the quality of his job: 'He did his job inaccurately so we can assume that he may be inaccurate.' or 'You Will Know Them by Their Fruits' sort of thing.
slapdash ADJECTIVE Done too hurriedly and carelessly. She frowned at the messy handwriting and slapdash clump of phrases.

Does 'egoistic' and 'egotistic' mean the same thing?.

No. While similar, they have some important differences. Consider this note on usage from the Oxford Dictionaries: The words egoism and egotism are frequently confused, as though interchangeable, but there are distinctions worth noting. Both words derive from Latin ego ('I'), the first-person singular pronoun. Egotism, the more commonly used term , denotes an excessive sense of self-importance, too-frequent use of the word 'I,' and general arrogance and boastfulness. Egoism, a more subtle term , is perhaps best left to ethicists, for whom it denotes a view or theory of moral behavior in which self-interest is the root of moral conduct. An egoist, then , might devote considerable attention to introspection, but could be modest about it, whereas an egotist would have an exaggerated sense of the importance of his or her self-analysis, and would have to tell everyone

