Đáp án:

1. Carrots are grown in his field. (by the farmer)

2. Carrots are being grown in his field now.

3. Carrots have been grown in his field for 2 months.

4. Carrots were grown in his field last year. 

5. Carrots were being grown in his field at this time last year.

6. Carrots had been grown in his field when his wife came back.

7. Carrots will be grown in his field next crop.

8. Carrots will have grown for 5 crops in his field by this time next month.

Giải thích:

Present/Past Simple:

AM/IS/ARE/WAS/WERE + V3

Present/Past Continuous:

AM/IS/ARE/WAS/WERE + BEING + V3

Present/Past/Future Perfect:

HAVE/HAS/HAD/WILL HAVE + V3

Will, must, have to,...:

WILL/MUST/HAVE TO,... + BE + V3

     -Minhh-

1. Carrots are grown in his field. (by the farmer)

2. Carrots are being grown in his field now.

3. Carrots have been grown in his field for 2 months.

4. Carrots were grown in his field last year. 

5. Carrots were being grown in his field at this time last year.

6. Carrots had been grown in his field when his wife came back.

...