using it as an adjective. for example: The teacher did his best to make class fun for his students, but his monotonous voice lulled them to sleep every time.
peaceful
If it were not for access to the Internet, this sentence would not be presented.
I'm studying to be an optician!
her house is 8 miles away
She was asked to tie the rope in a knot.
She wore neon colors so that she would be noticed.
soidiers used to wear armour
Thawing a frozen turkey will soften it.
Basically, you say the entire sentence without any variance in tone. No upturning of your words. Watch an episode of Daria, that's how you make a sentence with monotony. Unless, you're asking how to form a sentence that is in itself monotonous. In that case, you can't really because that's much more subjective.
The word "vivify" is a transitive verb. An example of a sentence using the word would be: Somehow, his brush with death had seemed to vivify him.
The only correction that I would offer is to make that question into two sentences, which would read as follows: Somebody's using my old bag. Is this sentence correct?
Make a sentence using hypothesis, controlled experiment and variable. Make a sentence using hypothesis, controlled experiment and variable.