HOMEWORK (2): Passive Voice

* Change the following sentences (active voice) into the passive voice. Use these tenses:

Present Simple; Present Continuous; Past Simple; Past Continuous; Present Perfect; Past Perfect; Future 'will'; 'Be going to'; Conditional 'would'; Modal verb 'can'.

(1) Mario writes a letter.
(2) My father planted this tree.

Note: 10 changes.