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 emplpoyer for not keeping its promise to pay her a bonus.

To restrict: to put limits on something.

This is a restricted area, so stay away.

We need to restrict them from talking to anyone about our project.

The government tried to restrict people from going there because it was too dangerous, but some people insisted on going

To negotiate: to deal with or bargain with others to reach an agreement.

Instead of starting a war, we should negotiate and find a way to compromise.

We are trying to negotiate a better deal, but it isn't easy.

He never wants to negotiate, so he has lost several important customers.

The price is too high, but if we negotiate we may be able to get a discount.

Responsible for or responsible to: to be responsible for something means to have the job of getting it done or taking care of.

If you are responsible to someone, it means that you are working under their control.

He is responsible to the CEO, so he can't sign the contract without her final approval.

or

She is the person responsible for improving sales last year, so we should give her a promotion.

Oversee or supervise: to control or direct a process or project.

One of his responsibilities was to supervise the rescue operations and keep things under control.

As product manager, she oversees the work of several departments.

It's my responsibility to oversee how things are being done and then make recommendations to the CEO.

To control or direct a process or project - to supervise

To put limits on something -to restrict

To be responsible for something means - to have the job of getting it done.

They broke our contract and didn't pay, so we sued them and won.

We need to restrict them from talking to anyone about our project.

If you are responsible to someone it means that you are working under their control.

We need to restrict them from talking to anyone about our project.

As product manager, she oversees the work of several departments.

We have many responsibilities, but she is the one responsible for product development.

She sued her employer for firing her, but she lost because they had the right to fire her.

He is responsible to the CEO, so he can't sign the contract without her final approval.