可以参考《结束蹦单词时代：外教教你用连词》,中国书籍出版社.
STILL,第26-27页：
1. I still work for the same company.
2. I am still using the cup you gave me.
3. I have still got a cold from our skiing trip.
4. I would still like to see you this weekend.
5. She is still not convinced that you love her.
6. He still is not fit enough to get up and walk around.
7. You still do not understand what I’m talking about.
8. We still have not decided where to go for our holiday.
9. They still will not listen to me.
10. I am not yet married to anyone.
11. We do not yet trust them.
12. They have not yet resolved the issue.
13. She can not yet ride a bike.
14. I am not ready yet.
15. He does not know the truth yet.
16. He has not apologized to me yet.
17. The baby can not walk yet.
18. You still have not written your essay yet.
19. She still has not rung me yet.
20. A: Have you done your chores (yet)?
B: No, not yet.
B: Not yet.
still 是副词.在第 1 到第 4 句中,still 表示“还是、仍然”.still 可以放在主语、助动词 be/ have 或情态动词后面,之后放从句.在第 5 到第 9 句中,still not、still...not 表示“还不、还没”.助动词 be 可以放在 still 前或后,但助动词 do/ have 和情态动词放在 still 后面,其后加 not,再放从句.在第 10 到第 20 句中,not yet、not...yet、still...not...yet 都表示“还未、还没有”.not yet 和 not...yet 的否定 not 前可以放助动词 be/ do/ have 或情态动词,而 still...not...yet 一般用现在完成时,即【主语＋still＋have＋not＋过去分词……yet】.在第 20 例句中,not yet 可以单独用来回答“Have...(yet)?”的问题.这些连词是口语和书面语.
YET,第23、27-28页：
1. She said she would be late, yet she arrived on time.
2. The teacher told him to stop chatting in class, yet he continued to chat despite the warnings.
yet 类似于 but,但因为也可以表示“尽管如此”,所以带有“意料不到的”或“意外”的语气.yet 一般放在后半句的开头,之后放从句.
NEVERTHELESS,第27-28页：
1. I'm really full from my dinner. Nevertheless, I still have room for dessert!
2. He suffered many setbacks, but never failed nevertheless, to reach his goals.
3. She didn’t receive any news from him in years, but always thought of him nevertheless.
nevertheless (尽管如此) 可以放在第二句的开头,之后放逗号,再放从句.还可以放在两个分句之间（前后都有逗号）,或在句尾.
still和nevertheless可以和but连用,但yet不行因为yet也表示but,这样有意义上的重复.
still是副词；yet和nevertheless既是副词又是连接词：
IhavenotdonemyhomeworkYET.（副词）
Shewasbeautiful,YETshedidn'thaveaboyfriend.（连接词）
Hewasn'tlisteningproperly,butheunderstoodNEVERTHELESS.（副词）
I'mreallyfullfrommydinner.NEVERTHELESS,Istillhaveroomfordessert!（连接词）