Which one of the following statements is true for the base forms of verbs?

a. add "to" to the base form to create an adjective.
b. when the subject of a sentence is singular, add "–s" to the base form.
c. add "–ed" to irregular base forms to form the past participle.
d. do not use a base form with plural subjects.

Read the passage: canines may not be the deepest thinkers in the world. but perhaps that's for the best. the life of a dog—sitting alone all day, waiting for everyone to come home—can be pretty boring. super-smart animals would probably get totally stressed out, says university of pennsylvania researcher james serpell. look at it this way: if dogs were any smarter, they probably wouldn't choose to hang around with us. which best describes the tone of the passage?

Read the exercept from robert stawell ball great astronmers,based on the context of the exerpct what does the word protacted most clearly means? a.seeming to be truthful b.weighing an excessive amount c.extending in a specific decision d.continuing for a long time e.being exceptional and talented

The travels of marco polo. which sentence best reflects author’s subjective perspective on the people of japan?