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.

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

A: 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
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Q: Possible Duplicate: Should I say 'Your order is now complete' or 'Your order is now completed'? What is better, 'complete' or 'completed'? I want to know which sounds the most encouraging. Which of these two promotes more of an elation or satisfaction of accomplishment. Personally I'm leaning towards 'completed' as the 'd' suffix bring a more substantial and abrupt ending, which to me more clearly signifies the significance of the accomplished item.

A: Complete, unlike completed, implies something whole or full. Completed means finished, accomplished, or done. A lot of the meaning overlaps, but I think completed gives a better sense of accomplishment, though it really depends on how you're using it.
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Q: This is something I always get confuse with (native language German). As far as I know 'did + verb' is something done and finished in the past. But isn't it the same with 'verb + ed'?.

A:
The normal way of talking about something in the past tense is to use 'verb + ed'. For example, 'I finished the project on time'. You might use 'did + verb' if you wanted to emphasise the point. In the previous example, if someone claimed that you completed the project late, you might say 'I did finish the project on time, and here's the evidence'. Using 'did + verb' where there is no doubt about the truth sounds strange to native English speakers. Saying something like 'I did go shopping for food yesterday' will probably lead to the response 'Well nobody said you didn't!'
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