Diamonds, as they are found, do not look very impressive. They are gray, greasy-looking pebbles. Experienced diamond miners can tell(distinguish) a diamond immediately. But some people have carried around(about) an unusual pebble for weeks before finding out that they had got a diamond.

LessionNINE TEXT A

Learned Words and popular Words
In every cultivated language there are two great classes of words which, (taken together, ---过去分词短语作条件状语，相当于if the two great classes of words are taken together)make up the whole vocabulary.


Could you tell A from B?
Cultivate ----cultivation
Well-cultivated
Stock market---stock exchange
Educate---education---educated
Well-educated
Be acquaint with
Informal
High
They were highly praised by their teacher.
I am used to the life style.
Important---importance
Lively
In case
I will take the umbrella in case it rains.
In the case---in this case---in that case
In that case , I had nothing to say.
Derivation
Adult
Apply for
I will apply for the visa to US.
Apply to
I won’t apply the method to you.
Application-----applicant
Application form
Classify----class
First class----economy class---grade
Convenience----inconvenient---inconvenience
Is it convenient for you to meet me at 4 tomorrow afternoon?
Avoid doing
I must avoid meeting you again.
Misunderstand---mislead---mistake.
present---absent
Generally speaking,
A puma at large
Appear
owing to ----because of