重點講解：
1. what if
（用于疑問句句首，尤用于詢問不希望看到的事發生時的結果）如果…怎么辦；
eg. What if this doesn't work out?...
如果這個不行怎么辦？
eg. What if relations between you and your neighbour have reached deadlock, and their behaviour is still unacceptable?
如果你和你的鄰居已鬧僵了，而他們的行為還是令人難以接受，那怎么辦？
2. waste time (in) doing sth.

浪費時間做某事；
eg. There could be many reasons and he was not going to waste time speculating on them.
原因可能有很多，他不打算浪費時間對此妄加猜測。
eg. Don't waste time thinking back to what you could have done differently yesterday.
不要浪費時間去想若是回到昨天你就可以做得更好。
3. an awful lot
（量）極大的，極多的；
eg. I've got an awful lot of work to do.
我有一大堆事情要做。
eg. We're having an awful lot of rain these days.
這些日子盡下雨。