oreover，furthermore，in addition
3.表转折对比关系的：however，on the contrary，but
although+clause( 从句)，in spite of+n/doing
on the one hand…on the other hand…
some…，while others…
4.表因果关系的：because，as
so，thus，therefore，as a result
5.表换一种方式表达：in other words
6.表进行举例说明：for example，句子; for instance，句子; such as+n./doing
7.表陈述事实：in fact
8.表达自己观点：as far as i know，in my opinion
9.表总结：in short，in a word，in conclusion，in summary
文中正确使用两三个好的句型，如：宾语从句、状语从句、动名词做主语等。
宾语从句举例：i believe tianjin will be more beautiful and prosperous.
状语从句举例：if everyone does something for the environment, our hometown will become clean and beautiful.
动名词做主语举例：reading books in the sun is bad for our eyes.
it's bad for our eyes to read books in the sun.
常用状语从句句型：
1)时间 when，no