6. so, “因此，所以”
It’s cold, so wear more.
so可与and连用，构成习语and so (相当so)
He told me to do it and so I did it.
Because he was ill, so he didn’t go to school. （误）
Because he was ill, he didn’t go to school. (正)
He was ill, so he didn’t go to school. (正)
7. for, “因为”
You’d better put on your coat for it’s very cold outside.（正）
For it’s very cold outside, you’d better put on your coat. (误)
He exercises every day, not because he likes sports but because he wants to keep fit. (正)
He exercises every day, not for he likes sports but for he wants to keep fit. （误）
8. as well as, “此外，也，既…又…”. 在连接主语时谓语动词要跟前面的主语保持一致，同时注意它强调的是前者。如：
Your mother as well as you is friendly. 不仅你而且你的母亲对我们都很友好。
The girl is lovely as well as healthy. 这个女孩既健康又可爱。
9. Both... and...“两个都” “既…又…”，用来连接两个并列成分。当连接主语时，谓语动词要用复数形式，其否定句为不完全否定。如;
Both Tom and Lily are friendly.
Both Tom and Lily are not friendly.
I can speak both English and Chinese.
She can both sing and dance.
10. not only...but( also )...“不但……而且……”.连接主语时，谓语动词跟but also后面的主语保持一致。如：
Not only you but also he is my friend.
The girl is not only lovely but also healthy.
She can not only sing but also dance.
11. Either…or…, “或者….或者…”“不是…就是…”“要么…要么…”. 其否定句表示全部否定，相当于neither…nor…。如：
Either you or I am wrong.不是你就是我错了。
He likes either tea or coffee. = He doesn’t like both tea and coffee.他或者喜欢茶或者咖啡。
He doesn’t like either tea or coffee.=He likes neither tea nor coffee.
Neither you nor I am a teacher.
He can neither play the piano nor play basketball.
I can speak neither English nor Japanese.