Because we are engaged with the teacher, but we don't know if she is? Because we want to keep in touch with friends, business.Because of the time we find out a friend We want to find which will make us lose time.
Since we have a very important teacher. But we do not know where I live. We want to contact the business with a friend. Since we find We must follow the This will give us time
Since we have important business to the teacher. But we do not know the teacher is. because we want to contact business with friends at the time, we find a friend because we have to walk to find, which will make our time.