can "however" be put ... Can “however” be put in different position in the following sentences, and do they have some different effects to the sentences? “…The scary thing, however, is that scientists have no idea to…” “…However, the scary thing is that scientists have no idea to…”

"might be"="may be "?

Do you think there is a pure friendship between men and wonmen? 你觉得男女之间有纯洁的友谊吗？

I have a crazy thinking recently ,i have a crazy thinking. as we konw the theories that conservation of mass and energy of conservation in the world, so have i came up with a crazy idea that is life of conservation in the world. body is just a carrier for life,and life will never out of bady, life has already existed in the world. so do more good things so that you will not become an animal next life !!haha

i have a question about the tense. could and can i know that "could" can be used as past tense of "can",but "could" also has an other usage.eg: "could you help me?" my question is if i were talking with someone,and suddenly thought of a real scene in the past where i need help,and i just wanted to know if he has had the ability to help me in that case. so,how should i ask? by the way, help me to correct the above sentences if i have made mistakes. thank you.

what are the differences between "would" and "could"? how to use them

how to improve the speed of typing english sentences? When typing english sentences we have to use the capital in front of every sentence,so that I have to click "shift" so frequently,how to solve this question?

Some phenomenons and views about gold investment.有关黄金投资 The gold was became one of the most hot investments in China recently ,which's price has touched 1910 $ per ounce last month.But,the high price didnt last long,then droped to 1650$ per ounce now.im not sure if the gold is so popular in other countries just like in China,and im wondering to know. There are some reasons given by professors why the gold price was so huge fluctuant are European debt crisis and easy monetary policy of USD.It is sounds reasonable,but is there only gold can be useed to avoid risk,how about other rare metals?As i know ,some other very useful rare metals's output and storage quantities are less then gold ,and their price are much lower than gold price .Actually ,both of the gold and the rare metals have the same attributes,even the rare metals are more useful in industry then gold.Gold price is so high because it is gold,we have been looking it as wealth for a long history,so that nobody will doubt its value and status.

what are the differents between "i won't go there" and "i will not go there "