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The difference between "I saw that some children were playing" and "I saw some children playing" lies in their grammatical structure and focus:

1. "I saw that some children were playing":

Grammatical structure: This sentence uses a clause ("that some children were playing") as the object of the verb "saw."

Focus: The focus is on the fact or event that "some children were playing." It emphasizes observing the situation or state rather than the action itself.

Usage: This structure is more formal and is often used to describe understanding or realization of an event.



2. "I saw some children playing":

Grammatical structure: This sentence uses a noun phrase ("some children") as the object of "saw," followed by a participial phrase ("playing") describing what the children were doing.

Focus: The focus is on directly observing the children and their activity. It emphasizes the action taking place.

Usage: This structure is more common and conversational when describing direct observations.

Key Difference:

"I saw that some children were playing" highlights the situation (as a whole fact or idea).

"I saw some children playing" emphasizes the children themselves and their action.