Which word in the sentence is the auxiliary verb?

i did mail your letter for you.

a.
did

b.
letter

c.
mail

d.
you

which word in the sentence is the main verb?

did you eat popcorn with ann during the movie?

a.
during

b.
did

c.
eat

d.
popcorn

which word in the sentence is the main verb?

the peaches were placed in baskets of different sizes.

a.
placed

b.
peaches

c.
were

d.
different

which words in the sentence are the main and auxiliary verbs?

julia will not go to the concert.

a.
not go

b.
will not

c.
will not go

d.
will go

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)