How should I write to my professor? I need my professor to write a certificate for me but I really don't know how to ask him about it politely. Shall I write this in the email: [dear professor, I have a little favor to ask for your help? ] Thank you very much!

what does "a major act of will" mean? what does "a major act of will" mean? Is it an idiom? Or can I say "a major act of" other things?

Trying to write a THNAK YOU letter to my professor! Is it polite enough? Thank you! Dear xxx I’m Maomao from SWU. I just finished a closed training just after the XXX summer school. We had a tight schedule during this training and I’ve just got out of those tough days(tough but rewarding days hhh ;)). At the same time, I also hurried to sit down and carefully record my love for your class and recall my harvest. I really want to express my thanks to you again and my love for your course, which has been very enlightening. I also majored in accounting in the university of China, so I chose the course of principles of accounting in xx summer school this time, mainly to explore the differences between Chinese and foreign accounting standards on the whole, and broaden my international financial perspective as well. However, I found that in addition to hard core knowledge, what I learned most was a way of thinking and learning. For example, when I had the same kind of course in my university, my teacher will be in the original attaches great importance to the master of the underlying element, such as requiring us to recite all the accounting items contained in each statement, and the subsequent in-depth accounting explanation only focused on the balance sheet, ignoring the possible connection between each transaction and the three statements. In your course, we can have a preliminary understanding of the operation principle of the whole accounting system and build a grand picture of the whole system, which can guide us to understand the relationship between different parts and guide us to think about problems from the perspective of making financial information and as an information user. And this really push me to think that the overall concept for beginners is also very important, which will be conducive to further learning. Although this requires a higher level of thinking ability, I still hope that the elementary accounting courses in my own university can also cover such profound but valuable things. At the same time, I also found the case analysis in class very interesting, which showed us the uniqueness and differences in the application of theories in practice. Thanks again for meeting your class this summer ! I want to show my love to you once again!

Please help me with a difficult sentence! I learned a sentence ‘The sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene transmitted’. The answer says the sentence means that the sex ratio can maximize the number of descendants an individual will have and hence maximizes the number of gene transmitted, so the sex ratio will be favored. I really don’t know why the writer can omit ‘maximizes’ before he mentions ‘the number of gene transmitted’. And I don’t understand why this sentence cannot be understood like ‘The sex ratio will be favored which maximizes the number of descendants an individual will have. And hence the number of gene transmitted.’ May be someone could help me to figure out. Thank you very much!

Why is this sentence syntactically correct? I read this sentence on my textbook: 「The first presents a problem a response to which the argument assesses.」 I know it is definitely a correct sentence since a teacher has used this sentence as an example in his class. But I still think there is something wrong. Why can a noun be followed directly by a noun? Why shouldn't there be a comma between 'a problem' and 'a response'? Even if there is a comma there, I still think the sentence doesn't make any sense. Because the connection between the two noun cannot be shown. So then, why is this sentence syntactically correct? ​Thanks a lot!!!!!!

How to greet with others online? It's kinda difficult for me! Recently I booked a room on Airbnb and found out that I didn't know how to greet with others. shall I start the conversation like 'Hi, xxx! Sorry to bother! I'm wondering that is it possible to book the room for one night?' Does it sound polite enough? Thanks a lot!!!

Is it ok if I write this as my self-description? Thanks a lot! I need to complete my personal information on Airbnb, so I wrote as follow: -University student -Love life love traveling love meeting new friends!​ -I hope I will not trouble anyone and meanwhile try my best to bring happiness to anyone I meet! :) Is it ok if I write this as my self-description? Thanks a lot!

why did the writer put an 'over' in the sentence? I've read about this sentence:'you can take a bike over on the ship', and I don't understand why the writer put the word 'over' in this sentence. And could I just say'you can take a bike on to the ship'？Hope that you can help me! Thanks a lot

Does the sentence sound authentic？ Thank you！ Can I say:' Here we don't get beautiful sights to hang out with friends.' Does the sentence sound authentic？