[Grammar] My dream is to buy / buy a car.

[wotcha]

1. What I did was prepare for dinner.

2. All I did was just eat.

3. The only thing I can do is run.

4. My dream is to buy a car.

5. My dream is buy a car.


I've learned that we can use bare infinitive when to infinitive is used as a complement of 'What noun + do + be verb ~',

'All noun + do + be verb' or 'The only thing + noun + do + be verb' clauses.

My question here is what about other kinds of clauses like sentence 5.

 

[Raymott]

1. What I did was prepare for dinner.

2. All I did was just eat.

3. The only thing I can do is run.

4. My dream is to buy a car.

5. My dream is buy a car.


I've learned that we can use bare infinitive when to infinitive is used as a complement of 'What Subject + do ~',

'All Subject + do ' or 'The only thin + Subject + do' clauses.

My question here is what about other kinds of clauses like sentence 5.

5 isn't natural. The others are. There is no 'do' verb in 4 or 5, so your rules don't apply.