The word "that" functions as an optional conjunction in English, and native speakers often omit it to improve rhythm and conciseness in casual speech. While grammatically interchangeable in many contexts, the inclusion of "that" serves as a structural "signpost" that clarifies meaning in long or complex sentences. Conversely, dropping the word in short, straightforward statements prevents redundancy and maintains a natural, conversational flow. In formal or academic writing, however, retaining "that" is preferred to ensure precision and clarity. Ultimately, the choice depends on sentence length and the desired level of formality, with native speakers instinctively using the word to anchor thoughts or break up bumping vowels. Mastering this nuance allows for more fluid communication and helps listeners track complex ideas more effectively.
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