set, sit

When the verb set means to put something down or to place an item on a surface, it takes a direct object (direct receiver of the action).

• Renate set the nachos on the card table.

However, set does not take a direct object in such expressions as the sun sets and liquids set.

• The sun rises in the east and sets in the west.
• The construction crew had to wait until the concrete set.

The verb sit rarely takes a direct object, so it needs a preposition such as on, in or beside.

• The squirrel sits on the branch, teasing the cat.

Sit does, however, take a direct object in such phrases as sit an exam or this car sits four passengers.

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