英文文法疑問

1.he's been there for over four hours
如果沒左"for"呢個字,呢句文法有沒錯?

2.
you have given me the most magical night i 've had
since i don't know when
呢句裡的since,意思是什麼?

3.
And tell her you are not never seeing her again
點解呢句要用現在進行?用將來式得唔符?

4.
I love reading books about nature in leisure time
呢句文法有沒錯?

5.All of our senses are called upon to help us learning
呢句文法有沒錯?

6.my uncle bought my brother and me to Taiwan's seashore.
呢句文法有沒錯?

7.Beyond the golden sand stretched the deep-blue sea
請翻譯此句