hello everyone<br/><br/>I want to identify the subject in the following clauses.<br/><br/>can I apply a substitution test in order to find out the subject?<br/>I really need an explanation.<br/><br/>There has been an accident.<br/>That she became a teacher I will never understand.<br/>To work hard is a prerequisite to success.<br/>I wasn`t a problem.<br/><br/>Thx alot <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/1.gif' alt='Emotion: smile'/>