1.       and words

and 不能放句首

also 不能放助动词前i can also play the piano. 不能连接俩否定陈述 either

too 同上第二条不用于否定陈述 either

as well 同上不用于否定陈述

anyway/besides 非正式，尤其用于口语中用于句首

furthermore 正式，尤其用于书面语中递进

2.       but words

but 不能连接两个动词

although/even though 用于句首

however/nevertheless 书面 n只用于句首
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on the other hand 可以单独用

in spite of/despite 后面跟-ing，不能跟句子

不能说 in spite of he had lots of money… 只能说 in spite of having lots of money…

3.       because words

because

as 多用于讲故事或描述

due to/owing to 正式书面 be后面不能跟 owing to 只能due to

thanks to 正态度

because of/as a result of 后者更正式

4.       if words

if 注意区分虚拟语气

even if 即使

unless 除非

in case 以防

suppose…?/supposing…? 口语假设= what if

or/otherwise 引出不好的后果

5.       therefore words (result)

so 口语

therefore 书面语

6.       in order to words (purpose)

to

in order to

so that