How to use "perhaps" and "maybe" ?

Yes, they are very similar and almost interchangeable. Just use them when you want. If you talk with the right person, he or she will correct you when you make a mistake. It's overcast today. Maybe it will rain later. If you can't decide, perhaps I can help you.

Hmmm... I think perhaps and maybe are almost interchangeable. You can use whether one of them. A child would be more likely to use Maybe, less likely to use Perhaps, perhaps because the root words May Be seem so accessible, intuitive, and immediate. Maybe perhaps is a simpler words. Perhaps also is more formal than maybe. Maybe is more casual. If you use it in writing, perhaps is more common than maybe. Maybe are common to use in conversation to address chance, or potential.

The words "Perhaps" and "Maybe" both denote uncertainty but not accurate. If you are a professional, you don't use those words. It will most likely get you in trouble. In casual communication, you can use one of those word since it has the same meaning.

I don't know, when i think "maybe", use maybe,

you can use them both in any instance. perhaps is just another word for maybe. so for example, you could say "perhaps we should go to the store." or you could say "maybe we should go to the store." either way is acceptable