5. Explain why the commas are necessary in this sentence.
The president of the United States should use rhetoric
straightforwardly, not manipulatively, when attempting to
convince the people to support his plans.

I am not sure.

Explanation:

I think the commas here place the connectors so instead of saying and not, thehy put a comma.

and the other one because it is the beggining of a new sentence but in the same subject, at least that is what I was told.

16.) true

17.) true

18.) it doesn't say

19.) true

20.) false

explanation:

what is the sentences