5. The two sides have agreed on the date of negotiations.
雙方商定了談判日期。
還能這樣說：
The two sides have set the date of the negotiations.
The two parties have fixed the negotiating date.

6. How does the negotiations go?
談判進展如何？
還能這樣說：
How about the negotiations?
How are the negotiations going?
諺語：
Dog does not eat dog.
同類不相殘。

7. The negotiation came to a deadlock.
談判陷入僵局。
還能這樣說：
The negotiations were at a deadlock.
The negotiations have reached an impasse.
應用解析：
at a deadlock 處于僵局，停頓狀態；
break a deadlock 打破僵局；
come to a deadlock 陷入僵局，停頓狀態，相持不下

8. The negotiations have gone really smoothly.
談判進展非常順利。
還能這樣說：
The negotiation is successful without a hitch.
The negotiations have made progress smoothly.
應用解析：
give one's hair a smooth 捋一捋頭發