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.

What can I call someone (a friend) who is always asking for favours such as: if you are going downtown, can you buy this for me please or, can you lend me your car for an hour or, if you have some spare time, can you post this letter for me please because I am so busy today He doesn't seem to realise or, pretends not to, that there is a limit to asking for help or favours from other people.
He may be called a moocher. It is used for a person who tries to get to something free of charge.

I am referring to someone who makes people 'buy' what he says and gets things done by them through nothing but clever speech something one can describe as crafty or beguiling, but not fraudulent. I pondered over con man and con artist for a while but those terms seem to hold a hint of crime, so those terms won't fit in. I am wondering if there is a more suitable phrase or word.
Sophistry is crafty speech intended to deceive, not necessarily out and out lying. So then a sophist is someone who does it. This is mostly just to win arguments though, not necessarily to get people to do things. That would be a demagogue, but that is someone, yes, who is clever with words but in a very specific way, appealing to the listener's baser instincts.

When you are writing about the seasons, should you capitalize their names? For example, would you say: I love the colors of the leaves in Autumn. Or should you say: I love the colors of the leaves in autumn.
The names of seasons should be left uncapitalized. However capitalization may be used to achieve a poetic effect.