If it’s not mentioned which tense we should use we can say : Yesterday, he was working all day, he will be working that long today as well.
Walking is the misplaced modifier. The correct sentence should be, "I found a twenty dollar bill while I was walking down the street."
South Africa faces a number of human right challenges regarding education (rural schools, educational right for disabled children,...),domestic violence , political rights and freedom , health (Africa has the largest number of people living with AIDS). Chapter Two of the Constitution of South Africa protects the human rights of all people in South Africa. Building and sustaining a human right culture is of great importance for every country, and so for South Africa.
