LANGUAGE TO PROVIDE CAUSE OR REASON
·        This is because: A vast majority of people prefer cycling. This is because riding a bicycle to work is healthier than driving.
·        This may be caused by: ….. This may be caused by the effects of global warming.
·        This can be explained by: This can be explained by the fact that movies have been considered to be fashionable and entertaining.
This can be explained by a huge amount of homework assigned by teachers.  
·        The reason for this is that: The reason for this is that happiness means different thing to different people.