Words to use in your essay
To say what you think:Personally - Personally, I don't think you can say that watching TV is a waste of time. (wat mij betreft)
In my opinion - In my opinion, as long as we monitor what we watch it can be an important part of our lives. (naar mijn mening)
Words to add another argument:
Furthermore - This species has a quiet charm and, furthermore, is an easy garden plant. (bovendien, verder)
Moreover - Texting while driving is dangerous; moreover, it’s illegal in some states. (bovendien)
Word to give an opposing argument:
However - On the river, however, the adventurers seemed to be perfectly safe. (echter, maar)