Can I negate want 要 or 想 in the past with 没？ For example： Because I was busy, I didn't want to go out to eat with her. Can be translated like this in Chinese? 因为我很忙，所以没要跟她一起出去吃饭。 因为我很忙，所以没想跟她一起出去吃饭。

Question about the usage of 很: I learned that between a subject and an adjective you had to put 很 in between to link them. For example, 我很好，你很聪明，美国很大。 But then I was learning about the weather and saw 今天天气凉快，今天天气热... Why is there no 很 in these sentences?

Are these sentences gramatically correct? If yes, do they have a difference in meaning or tone? 你知道海边怎么样？ 你知道海边怎么样吗？ 你知道海边怎么样呢？