Tense: PRESENT SIMPLE

Active: They buy the house.

Passive: The house is bought (by them).

EJERCICIO

Tense: PRESENT CONTINUOUS

Active: They are buying the house.

Passive: The house is being bought (by them).

EJERCICIO

Tense: PAST SIMPLE

Active: They bought the house.

Passive: The house was bought (by them)

EJERCICIO

Tense: PAST CONTINUOUS

Active: They were buying the house.

Passive: The house was being bought (by them)

EJERCICIO

Tense: FUTURE SIMPLE

Active: They will buy the house. 

Passive: The house will be bought (by them).

EJERCICIO

Tense: PLANNED FUTURE

Active: They are going to buy a house.

Passive: They house is going to be bought (by them).

EJERCICIO

Tense: PRESENT PERFECT SIMPLE

Active: They have bought a house.

Active: A house has been bought (by them).

EJERCICIO

Tense: PAST PERFECT SIMPLE

Active: They had bought a house.

Passive: A house had been bought (by them). 

EJERCICIO

Tense: MODAL VERB

Active: She must buy the house. 

Passive: The house must be bought (by them).

EJERCICIO

Tense: MODAL PERFECT

Active: She must have bought the house. 

Passive: The house must have been bought (by them).

EJERCICIO