Transitive and Intransitive Verbs

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Transitive verbs must have a direct object:

I enjoyed the party (NOT: ~~I enjoyed~~).

(The subject is 'I', the verb is 'enjoyed' and the direct object is 'the party'.)

William likes chocolate (NOT: ~~William likes~~).

(The subject is 'William', the verb is 'likes' and the direct object is 'chocolate'.) Intransitive verbs can't have a direct object. Intransitive verbs also can't make a passive.

They arrived.

(The subject is 'they' and the verb is 'arrived'. There's no object.)

The children are sleeping.

(The subject is 'the children' and the verb is 'are sleeping'. There's no object.)

Many verbs have a transitive and an intransitive form:

John ate the pizza (transitive).
John ate (intransitive).

Also, some verbs that have more than one meaning can be transitive or intransitive depending on which meaning is being used.

I see the mountains (see = see with your eyes, transitive).
I see (see = understand, intransitive).

Transitive and Intransitive Verbs

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