五大句型
1.主语+连系动词+表语
He is a Chinese.
Eg:keep taste都可以作为及物和不及物动词，
比如：这道菜很好吃。The dish tastes delicious.
2．主语+不及物动词
He came /to school/ early.
不及物动词我们有三种结构：
1，he came.他来了。
2，后面你要加介词宾语，Eg:He came to school.
3，你还可以加个副词变成状语：He came to school early.
3. 主语+及物动词+宾语
Tom played football yesterday.（普通及物）
Eg:I like sports.
I watched TV last night.
4. 主语+及物动词+间接宾语+直接宾语
He teaches students English. （（双及物）
Buy也是双及物动词，如：I bought a pair of trousers for my mum./I b ought my mum a pair of trousers.而这里的 He teaches students English.也可以变成He teaches English to students.
5. 主语+及物动词+宾语+宾语补足语
We call him Mr. Mo （复合及物）
我叫他来教室。I asked him （宾语） to come to classroom.（不定式作宾补）
学好这五个句型就可以千变万化，万变不离其宗，以这句话作为例子：Tom played football yesterday.可以变成：Tom, a student who likes keeping fit, played football yesterday with his friends after they finished their work.
英语分为八类
一个简单句是句子的主干，英语句子的成分分为八类主，谓，宾，表语，定语，状语，补语还有同位语，这里加了a student（同位语） who likes … （定语从句）再加介词短语after they finished their work.（状语从句）所以从理论上说，句子可以无限延伸。这所有的都是以刚才五个句型作为基本的，所以我们的同学要学好英语，首先这五个基本句型是关键，以后很多问题可以迎刃而解。