Intransitive verbs have the pattern N + V (noun + verb). The clause is complete without anything else:


Noun Phrase (Subject) Verb Phrase
The baby
was sleeping

(John) (smiled).
(Nothing) (has happened).
(The baby) (was sleeping).




"That" here is used to refer to a thing that smells bad, so we do not need to use an adjective after "smells".
Some verbs can either be intransitive or transitive. You can learn more about transitive and intransitive verbs on Cambridge Dictionary.

Hello saipathudut,

You are right that an adjective could come after 'smells' here, if we wanted to give more information. However, it is not necessary. 'That smells' means that it smells unpleasant, without any other details, just as 'That hurts' tells us about the pain, but not in any detail. There are a number of verbs which work like this: smell, hurt, sting, ache and tickle, amongst others.

Best wishes,



The LearnEnglish Team

Sir, I have heart that only intransitive verbs can be used to make passive voice sentences. Is that true????

Passive voice is the structure of a clause in which we put the object of a verb in subject position. So the verb must be a transitive verb (which needs a direct object).

No intransitive verb is used in passive voice. Passive voice can only be made with transitive verb. Like, He killed a tiger - a tiger was killed by him.

Hello sanka bandara,

No, that is not correct - passive forms are impossible with intransitive verbs. Most transitive verbs can have passive forms, though some transitive verbs, such as stative verbs, are not normally used in the passive either.

Best wishes,

The LearnEnglish Team

So surprised!!! I got a 100% on this exercise . Thank you very much The LearnEnglish Team. This website is really helpful. Now, my English skills are getting better.

I didn't understand what is difference among that phrases?

me too i didn't understand what is different between them?

Hello Roka2010,
Some of the verbs are intransitive (no object) and some are transitive (with an object).  You have to decide which are which.  You don't see full sentences, and have to think about if the verbs that you see need an object or not.
For example
She is relaxing  >  this is intransitive - there is no need for an object.
She is making  >  this is transitive - it needs an object of some kind ('She is making dinner / the bed / problems / a cake' etc.
I hope that clarifies the exercise.
Best wishes,
The LearnEnglish Team