can i register using same email id for a 3 different profile types This project is related to add social service work details into my website. 
I used profile2 module to create a 3 profile types and its create successfully.
we have 3 profile types,
1) Single User
2) Comapny
3) NGO

Can i register on above 3 profile types using same email Id because if single user is chairman of company and they wants to register as comany using same email id so it is possible.
same like if single user is chairman of NGO and also they wants to register NGO using same email Id then it is possible or not.

How i can manage this situation.please help me
You may need Shared Email module for this. It allows multiple email accounts with same email address.