間 & ながら, どんなに ~ても & いくら ~ても, 最中 1. What is the difference between and ? Doesn't just mean "while" while can also mean "during"? 2. ~ and ~ both mean "no matter how". Are they interchangeable or not? 3. Also, how is saying different from just using the form of a verb?

1. I think you are right. For example, (I eat foods while watching the TV.) , (turtles hibernate during winter.).

2. ~() is used with pronoun, adjective, and verb. is used with adjective and verb but with pronoun is unnatural like . So they are interchangeable except pronoun.

3. verb + means progressive like I am reading the book() and means "in the act of" and "be engaged on" like I am in the act of reading the book(). They are same meaning, aren't they?