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: 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!'