To sue:to take someone to court in a legal disagreement.
They broke our contract and didn't pay, so we sued them and won.
She sued her employer for firing her, but she lost because they had the right to fire her.
(When she left her job she sued her employer for not keeping its promise to pay her for a bonus.)
To restrict: to put limits on something.
This is a restricted area, so stay away.受限制的；保密的
We need to restrict them from talking to anyone about our project.
(We have unlimited access to their research and there are no restrictions on how we use the information.)
To negotiate: to deal with or bargain with others to reach an agreement.谈判，交涉 讨价还价
Instead of starting a war, we should negotiate and find a way to compromise.妥协
We are trying to negotiate a better deal but it isn't easy.
(The price is too high, but if we negotiate we may be able to get a discount.)
Responsible for/to: To be responsible for something means to have the job of getting it done or taking care of.负责的
If you are responsible to someone, it means that you are working under their control.
(She was the person responsible for improving the sales last year, so we should give her a promotion.)
Oversee or supervise: to control and direct a process or project.
One of his responsibilities was to supervise the rescue operations and keep things under control.责任；职责
As a project manager, she oversees the work of several departments.
(When we got to the accident, everyone was confused because there was nobody there to supervise.)
(If something is confidential, you should restrict access to it.) 机密的
(We can't trust him, so we will have to restrict his activities until we know him better.)
