Jawaban:

1) a) (+) they read the book everyday

(-) they don't read the book everyday

(?) do they read the book everyday?

b) (-) she doesn't brush her teeth

(+) she brushes her teeth.

(?) does she brush her teeth?

2) go - went

come - came

buy - bought

go - went

bring - brought

forgot - forgotten

forget - forgot

know - knew

3) a) (-) she didn't read the novel last night

(+) she read the novel last night

(?) did she read the novel last night?

b) (?) did they sing a song yesterday?

(+) they sang a song yesterday?

(-) they didn't sing a song yesterday.

4) Alex is taller than Billy

Billy is shorter than Alex

5) tv is the most expensive of all

radio is the cheapest of all