简单句
由一个主语(或并列主语)和一个谓语(或并列谓语)所构成的句子叫简单句，其结构是主语+谓语。
1. 主语+谓语
主语+不及物动词：They are dancing.
2. 主语+系动词+表语
系动词to be：We are students.
系动词为turn, get, become, look：
Things become complicated.
The leaves are turning yellow.
You will get older.
3. 主语+谓语+宾语
主语+不及物动词+介词/副词+宾语：She picks up the coin.
主语+动词+to do作宾语：I prefer to take a walk.
主语+动词+doing作宾语：We like having a party.