and(和) - A and B 连结事物A和事物B - Nutella AND banana mix together well.
but(但是) - ... but ... - The Nutella and banana mix is tasty BUT unhealthy.
or(或) - A or B 事物A或事物B - You can have either Nutella or banana for dessert.
otherwise(不然) - Brush your teeth often,OTHERWISE gum disease could form.
for - For your own good, you should brush teeth often.
yet - I haven't brush my teeth YET.
so - Nutella is SO tasty.
therefore - Since I do not brush my teeth, THEREFORE
however - I have a car, HOWEVER I haven't driven it for a while.
详细看GRAMMAR书或查辞典吧.