To decide to do something in English, you can say "to make a decision" or "to decide." For example:

I have decided to go to the party tonight.

After much consideration, she made the decision to quit her job.

The phrase "to make a decision" comes from the verb "to make," which means "to create or bring into being," and the noun "decision," which refers to a choice made between two or more options. In this context, "to make a decision" means to choose one option over the others.

Here are some more examples of "to make a decision" in action:

The company made the decision to move to a new location.

I'm still trying to make a decision about what to do with my life.

The phrase "to decide" also comes from the verb "to decide," which means "to come to a conclusion or make up one's mind." In this context, "to decide" means to choose one option after considering the available options.

Here are some more examples of "to decide" in action:

She decided to go to the beach instead of the mountains.

We need to decide on a date for the party.

In both cases, the speaker is choosing one option over the others and committing to it.