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T: So we can say ‘The green bag is the cheapest one of all the bags.’ （所以我们可以说绿色的包是所有包中最便宜的。)
T: But how can we talk about the purple one? Can we add ‘-est’ to ‘expensive’ too?
（但是我们如何来谈论紫色的包的价格呢？我们也能在expensive’后面加上 ‘-est’吗？）
Ss: No. We should ….
T: OK. We know that ‘cheap’ is a short adjective while ‘expensive’ is a long adjective.
（很好！我们知道cheap是一个短形容词，而expensive是一个长形容词。）
T: We add ‘-est’ to short adjectives to compare three or more people or things.
（我们在短形容词后面加上‘-est’来比较三个或三个以上的人或事物。）
T: Obviously, we can’t add ‘-est’ to the word ‘expensive’. We should use ‘most’ for long adjectives.
（显然，我们不能在expensive后加‘-est’。对于长形容词，我们应该在它的前面加上most。）
T: So, we should say like this: The purple bag is the most expensive one of all the bags.（紫色的包是所有包中最贵的。）
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Grammar
as ... as 意为“和……一样”，表示同级的比较。
其基本结构为：as + adj./adv.(原级) + as
as … as
We use________ to say that people or things
are the same in some ways.
Picture 1 is beautiful.
Picture 1 is as beautiful as Picture 2.
像……一样漂亮
Picture 2 is beautiful too.
The yellow cat is lovely.
The yellow cat is as lovely as the white one.
像……一样可爱
The white cat is also lovely.
Linda
Nancy