用法和however一样，不能连接两个句子，但是意思上有承接概念
2.系表结构
系表结构有两部分构成：连系动词和表语。 连系动词分为三类：be 动词，感官动词，趋势动词。 1) Be 动词：am, is, are, was, were 2) 感观动词：sound, look, keep, taste, feel, smell 3) 趋势动词：appear, become, grow, get, turn, seem, remain, go
Meanwhile, my tongue was busy searching out the hole where the tooth had been. I suddenly felt very worried, but could not say anything. When the dentist at last removed the cotton wool from my mouth, I was able to tell him that he had pulled out the wrong tooth
❖ impossible通常不以人作主语，而以不定式或从句作主语
e g: It is impossible for him to help you.
=It is impossible that he will help you .
1.meanwhile adv. 同时
meanwhile=at the same time=in the same time
He knew I collected match boxes and asked me whether my collection was growing. He then asked me how my brother was and whether I liked my new job in London. In answer to these questions I either nodded or made strange noises.
