1. because meaning: for the reason that;since
therefore meaning : for that object or purpose
since meaning: in the intervening period between (the time mentioned) and the time under consideration, typically the present.
2.it reflects what it is trying to say in a sentence or meaning
3.they work when u are trying to say a phrase or a sentence
4. in some yes it has to be followed by a sentence but not always
it late but for the next person who needs it
