I.

1. C

2. B

3. D

4. A

II.

do - did - done

go - went - gone

be - was/were - been

hit - hit - hit

break - broke - broken

eat - ate - eaten

write - wrote - written

build - built - built

send - sent - sent

know - knew - known

see - saw - seen

meet - met - met

have - has - had

leave - left - left 

think - thought - thought

tell - told - told

say - said - said

buy - bought - bought

come - came - come

make - made - made

III.

1. learned

2. has read

3. drived

4. lived

5. did you do

6. have you been

7. haven't been

8. have leaned

9. haven't saw

10. haven't bought

          Ex 1:

1-C

2-B

3-D

4-A

Công thức:    Đuôi /ed/ được phát âm là /id/: Khi động từ có phát âm kết thúc là /t/ hay /d/.

                       Đuôi /ed/ được phát âm là /d/ với những trường hợp còn lại.

            Ex2:

Do ⇒ did ⇒ done

Go ⇒ went ⇒ gone

Be ⇒ was ⇒ been

Hit ⇒ hit ⇒ hit

Break ⇒ broke ⇒broken

Eat ⇒ ate ⇒ eaten

Write ⇒ wrote ⇒ wroten

Build ⇒ built ⇒ built

Send ⇒ sent ⇒ sent

Know ⇒ knew ⇒ known

See ⇒ saw ⇒ seen

Meet ⇒ met ⇒ met

Have ⇒ had ⇒ had

Leave ⇒ left ⇒ left

Think ⇒ thought ⇒ thought

Tell ⇒ told ⇒ told

Say ⇒ said ⇒ said

Buy ⇒ bought ⇒ bought

Come ⇒ came ⇒ come

Make ⇒ made ⇒ made

          Ex3:

1- have learned

2- has read

3- has drived

4-has lived

5- What did you do

6-How long did you been here

7-has never been

8- have learned

9-have never saw

10- have never bought

Xin hay nhất ạ