We can all do much more than we think, once we decide to do it.

When you decide to do something, stick to it.

It will never be late when you decide to do something.

I decide to do something special for my mum.

At this point I don't care what you decide to do.

He decides to go to Hong Kang on vacation.

I decide to go to bed early tonight.

When the weather began to rain, I decided to go home.

I decide to go shopping tomorrow.

I will decide to go to park tomorrow.

这些例句涵盖了不同的情境和用法，希望对你有所帮助。