把十五個選項按詞性分別歸入名詞、動詞、形容詞、副詞等類別。
縱觀樣題和真題，我們知道15個詞彙都屬於最重要的四類實詞。我們要學會每種詞彙的基本搭配和基本用法。
辨性要注意下面幾點。
1.遇到動詞進行二次分類：確定時態，確定是第三人稱單數還是非第三人稱單數;但應注意動詞+ed型的有兩種可能性，動詞或形容詞;遇到名詞要確定單數還是複數。
2.不認識的單詞，看字尾。構詞法中，字首表明意思，字尾表明詞性。所以看一個詞的字尾，往往能大致分出詞性。
3.詞性一時無法確定的，暫時擱置，不必糾纏，影響全域性。
4.作出相應的標記。可直接用自己最清楚的符號清楚標在每個詞前後。不清楚的都標問號。
下面我們拿真題來剖析，真題如下：
EI Nino is the name given to the mysterious and often unpredictable change in the climate of the world. This strange 47 happens every five to eight years. It starts in the pacific Ocean and is thought to be caused by a failure in the trade winds(信風), which affects the ocean currents driven by these winds. As the trade winds lessen in 48 , the ocean temperatures rise, causing the Peru current flowing in from the east to warm up by as much as 5℃(degrees centigrade).
The warning of the ocean has far-reaching effects. The hot, humid (潮溼的.)air over the ocean causes severe 49 thunderstorms. The rainfall is increased across South America, 50 floods to Peru. In the West Pacific, there are droughts affecting Australia and Indonesia. So while some parts of the world prepare for heavy rains and floods, other parts face drought, poor crops and 51 .
EI Nino usually lasts for about 18 months. The 1982-83 EI Nino brought the most 52 weather in modern history. Its effect was worldwide and it left more than 2,000 people dead and caused over eight billion pounds 53 of damage. The 1990 EI Nino lasted until June 1995. Scientists 54 this to be the longest EI Nino for 2,000 years.
Nowadays, weather experts are able to forecast when an EI Nino will 55 , but they are still not 56 sure what leads to it or what affects how strong it will be.
其選項如下：
A) estimate;B) strength;
C) deliberately;D) notify;
E) tropical; F) phenomenon;
G) stable; H) attraction;
I) completely; J) destructive;
K) starvation; L) bringing;
M) exhaustion; N) worth;
O) strike
以真題為例辨詞性，
A) estimate; B) strength;
C) deliberately; D) notify;
E) tropical; F) phenomenon;
G) stable; H) attraction;
I) completely; J) destructive;
K) starvation; L) bringing;
M) exhaustion; N) worth;
O) Strike
名詞：B,F,H,K,M
(B的字尾th, H、K、M的tion都是名詞字尾)
謂語動詞：A,D,O
(A的-ate極可能是動詞，D的-fy為動詞字尾)
非謂語動詞：L(-ing結尾)
形容詞：E, G, J(E的-cal, G的able, J的tive是形容詞字尾)
副詞：C和I(ly加在形容詞後為副詞字尾)
注意：即使從沒見過，也想辦法看能否判斷其詞性，詞的性質有時比詞義還重要。詞的性質並不總是固定的，有些不認識的或無法確定的，如N) worth (adj./n.)，可先擱置，不要過度糾纏。
