任江南江北worthwhile的两个固定句型：
be worthwhile doing / to do; It is worthwhile to do sth.做……是值得的
eg. a worthwhile experiment/job.
The experiment is worthwhile.
It didn t seem worthwhile writing it all out again.
It might be worthwhile to reconsider your attitude to the new policy.
比较： be (well) worth (doing) sth.
be worthy of being done / sth
be worthy to be done…
eg. The book is _________________ reading the book. = It is worthwhile to read the book.
= The book is
in the tree 指树本身以外的事物或人附着在树上, 如鸟等动物；
on the tree 指树本身生长出来的东西, 如果实, 花等。 (1) spend
你暑假怎么打发? How will __________________________?
他把钱都花光了。He has spent all his money.
1) spend sth (on sth)/ (in) doing sth用(钱);花(钱)
他将全部积蓄花在一辆新车上。He spent all his savings on a new car.
2) 花费 spend sb spend … on sth in (doing) sth
pay sb pay some money for sth
cost sth cost sb some money
take It takes sb … to do sth
eg. He _____ about a third of his salary in drinking.
She ____ 3000 dollars for the dress.
The DVD ____ her 150 yuan.
It ____ him ten days to finished the work.
(2) observe (n. observation) vi.&vt. to notice/ watch carefully 观察，注意到。
observe + n./pron./sb. doing/do sth/that-cl
eg. The scientist has observed the stars all his life.
I observed a stranger go/going into the office.
Though having lived abroad for years, many Chinese still ____ the traditional customs.
A. perform B. possess C. observe D. support
her project. 在她母亲头几个月来帮忙后，她才得以开始自己的计划。
将only及其后面的状语提前放在句首,句子要用部分倒装语序，即将be动词、助动词或情态
动词放在主语之前。
(1) only+状语“+部分倒装
只有这样，我们才能学好英语。 Only in this way_______________________.
到那时我才意识到我的错误。 Only then _______________________.
(2) 但Only +主语时不倒装
只有你了解我。Only you _______________.
1). 只有当你明白我的意思了, 你才能认识到你的错误。
