Active/Passive
Who/which/whom/whose
Gerund or Infinitive
What was first
Past modals
100

The host always serves the food to everyone else before he starts to eat himself. 

The food is served to everyone by the host before he starts to eat himself.

100

I know the girl. She lives in our street.

I know the girl who lives in our street.

100

Instead of _____________(play) computer games, you should consider ________________ (walk) the dog.

Instead of playing computer games, you should consider walking the dog.

100

Mary _______________ (come) home after she _______________( finish) all her work.

Mary came home after she had finished all her work.

100

Jack isn´t here any more. I am sure he left.

He must have left.

200

Condiments or seasoning should be added only after the meal has been tasted. (general You)

You should add condiments or seasoning only after you have tasted the meal.

200

The animals are very shy. They live in the wilderness.

The animals which live in the wilderness are very shy.

200

As a result of _________________(study) hard, Peter has succeded in __________________(pass) all his exams.

As a result of studying hard, Peter has succeded in passing all his exams.

200

My best friend __________________(help) me with the garden for several moths.

My best friend has been helping me with the garden for several moths.

200

I do not believe that Jack stole the money. it is impossible.

Jack couldn´t / can´t have stolen the money.

300

Lily H.Hammond first used the term "pay it forward" in her book in 1916.

The term "pay it forward" was first used by Lily H.Hammond in her book in 1916.

300

Yesterday I met a man. The man had won the Olympic medal.

Yesterday I met a man who had won the Olympic medal.

300

James advised me_______________ (apply) for a job, whereas Jane suggested _________________(go) on holiday.

James advised me to apply for a job, whereas Jane suggested going on holiday.

300

Before John ___________________ (invite) Jane for dinner, he ___________________ (ask) her friends what food she liked.

Before John invited Jane for dinner, he had asked her friends what food she liked.

300

It is possibe that they missed the bus.

They might have missed the bus.

400

People consider sincere compliments or nice comments to be the ways of "paing it forward".

Sincere compliments or nice comments are considered to be the ways of "paing it forward".

400

There is a girl. Her father is my maths teacher.

There is a girl whose father is my maths teacher.

400

I just cannot imagine _________________ (write) a test without ___________________(have studied) before.

I just cannot imagine writing a test without having studied before.

400

If they ___________________(have) more time, they __________________ (visit) us more often, but they don´t.

If they had more time, they would visit us more often, but they don´t.

400

It is possble that I was a similar situation but I do not remember it.

I might have been in a similar situation, but I do not remember it.

500

We considered it impolite when the guest had started eating his meal before we served everone else.

It was considered impolite when the guest had started eaiting his meal before everyone else was served.

500

I can see the boy. I tried to call him last week.

I can see the boy whom I tried to call last week.

500
Mr Brown had agreed _________________ (give) us the key, but later he denied _________________(say) that.

Mr Brown had agreed to give us the key, but later he denied saying that.

500

We _____________________(call) you yesterday if we _____________________ (know) it was your birthday.

We  would have called you yesterday if we had known it was your birthday.

500

It wasn´t a good idea to cheat at the exam yesterday. Peter did it and he was caught by the teacher.

He souldn´t have cheated at the exam yesterday.

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