Hello,<br/><br/>The 'while-whereas-however' is used to contrast two facts etc.<br/><br/>I am not able to use these words properly.<br/><br/>1. Ram is very hard worker, while his brother is not.<br/><br/>2. Ram is very hard worker, whereas his brother is not.<br/><br/>3. Ram is very hard worker. However, his brother is not.<br/><br/>Are the above sentences correct?<br/><br/>Can we use "while" and 'whereas' interchangeably?<br/><br/>Thanks.