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.
In my opinion - In my opinion, as long as we monitor what we watch it can be an important part of our lives.
Words to add another argument:
Furthermore - This species has a quiet charm and, furthermore, is an easy garden plant.
Moreover - Texting while driving is dangerous; moreover, it’s illegal in some states.
Word to give an opposing argument:
However - On the river, however, the adventurers seemed to be perfectly safe.