Answer:
1. to arrive - intransitive, to greet - transitive
2. to buy - transitive, to go - intransitive
3. to laugh - intransitive, to come (out) - intransitive
4. to read - transitive, to fall (asleep) - intransitive
5. to sleep - intransitive, to be - intransitive
6. to lie (down) - intransitive, to like - transitive; to sleep - intransitive verb, here used as the object of the verb to like.
7. to catch (up) - intransitive, to write - transitive
8. to sneeze - intransitive, to fall - intransitive
9. to sit (down) - intransitive, to wait - intransitive
10. to pass - transitive
11. to turn (off) - transitive, to go - intransitive, to sleep - intransitive
12. to move - transitive
Step-by-step explanation:
Depending on whether a verb requires an object or not, it can be transitive or intransitive.
Transitive verbs are verbs that require an object - the recipient of the action expressed by the verb. For example, in the first sentence, we have the verb to greet. If the object was omitted, the verb wouldn't make much sense. We need the information about who is greeted.
Intransitive verbs are the opposite - they don't require an object, i.e. can't be used with it. For example, the verb to arrive doesn't require an object. It doesn't express an action that needs a recipient.
Some verbs can be both transitive and intransitive depending on the context.