Dear Babystudent, Diana,
�Thus � (a formal or literary adverb)
1) �Thus � = �As a result or as a consequence of this �.
"Angela Mirkel won the election, thus becoming President". (That is how she became President).
2) �Thus � = �In this way �; �In the manner now being shown or indicated �.
"Hold the pen in your hand, thus, the way that I am holding my pen". (Teacher shows the student the pen in the hand.)
3) �Thus � = A modifier, �Up to this time �; �Up to this point �.
"England are winning the football match thus far!" (Up till now, England are winning but it may change!")
1) �Hence � = �As a consequence �; �For this reason �.
"There are thousands of lorries, hence a lot of pollution" (That is why there is pollution.)
2) �Hence � = When used after a period of time, �From now �.
"In two years hence, because of improved trade, my country will probably be rich". (In two years � time ... ...).
3) Hence = �From here � (very old-fashioned, archaic, not now used.)
"Leave my house. Get hence!" (Get out of here!)
�Therefore � = �For that reason �; �consequently �.
"The dancer broke her leg, therefore she couldn �t enter the Dance Competition. (That is why she couldn �t... ...).
The words �thus �, and particularly �hence �, are literary, formal words, not often used by �ordinary people � in the area where I live, except in documents and in University work.
I hope that this helps you.
Bis Spater! Tschuss!
Les