B2.2 Checkpoint 2 REVIEW

Active voice: Litter from plastic products has dirtied many of our cities.

Passive voice: Many of our cities .... by litter from plastic products.

• has dirtied

• have been dirtied

• has been dirty

Active voice: People have made chocolate for 4,000 years.

Passive voice: Chocolate (a)  

Answer explanation

Did you add "by people"? In this case it's unnecessary because it's too obvious and general!

Active voice: Next week, my dad will take my bike to the mechanic.

Passive voice: Next week, ...

(a)  

Answer explanation

Remember that future simple in passive voice is: will be + past participle

Active voice: My brother will have fixed my car by the end of the week.

Passive voice: My car (a)   by the end of the week.

Answer explanation

Did you pay attention to all the verbs? If a sentence is in future perfect, the passive voice is: will have been + past participle

Choose the only verb that is followed by another verb in gerund (-ing).

• want

• love

• choose

• remember

• promise

Answer explanation

Remember that verbs that express feelings (like, love, hate, etc) can be followed by both an infinitive or a gerund.

HOWEVER, enjoy is only followed by a gerund.

Complete the sentence with an infinitive or a gerund:

You should avoid (a)   here. (swim)

Answer explanation

The verb avoid is followed by a gerund! Did you remember to spell "swimming" correctly?