5. I'm on your side.
我是站在你這邊的。
還能這樣說：
I will support you.
I stand by your side.
諺語：
The grass is greener on the other side.
這山看著那山高。

6. He's efficient.
他很能干。
還能這樣說：
He is capable.
He has a lot on the ball.
應用解析：
efficient in 在……有成效；
be fully efficient 充分發揮效力的；
be highly efficient 高效率的

7. He's very vague.
他是個難以捉摸的人。
還能這樣說：
He is difficult to understand.
He isn't very clear.
應用解析：
one's very thoughts 正是某人的想法；
the very reverse of the truth 與事實完全相反

8. He's faithful.
他是守信用的人。
還能這樣說：
He is a man of his word.
He stands to his word.
應用解析：
words and deeds 言與行；
word came that 有消息傳來說