英语基本句型有五个：S+V, S+V+Cs, S+V+O, S+V+Oi+Od, S+V+Od+Co, 其共有特征是主谓结构(S+V)。
句子成分主要有四种：主语S、谓语动词V、补语（主语补语Cs，宾语补语Co）和宾语（直接宾语Od，间接宾语Oi)。
●Pattern 2 (S + V + Cs)
1． 此句型的 "V" 是连系动词，"Cs" 是主语补语，或称表语。充当主语补语的有名词、代词、形容词、副词、数词、介词短语、动词 V-ing 形式或 V-ed 形式、不定式及名词性从句等，如：
My first name is Bill.
Life is colorful.
Seeing is believing.
Our belief is that things will improve.
2． 常见的连系动词有下列几类：
a. 表示"判断"：be；
b. 表示"变得"、"成为"：become, come, go, fall, get, grow, prove, turn 等；
c. 表示"保持着某一状态"：hold, keep, lie, remain, rest, sit, stay 等；
d. 表示"看起来"、"好像"：appear, look, seem 等；
e. 表示"实感"：feel, sound, taste, smell 等。
e.g. She is a teacher and I am a doctor.
Spring comes and all trees turn green.
He stayed awake all night.
You don't look happy, what's the matter?
Their plan sounds wonderful.
