Why You Can't Understand Sentences (Even Though You Know All the Words)

The speaker identifies three main reasons for not understanding sentences: insufficient familiarity with individual words' multiple meanings, unfamiliarity with the grammar at play, and missing external context.

Many words have multiple meanings or subtle nuances. Learners often only know one or two meanings, leading to confusion when a word is used in an unfamiliar sense. Examples like 'hard' and 'sad' illustrate this point. The difficulty also extends to identifying which meaning is relevant in a specific sentence, shown by the 'garden path sentence' example: 'The old man the boat'.

Language learners sometimes assume sentences are just a sum of their words, overlooking the role of grammar. The example of 'people eat apples' versus 'apples eat people' demonstrates the importance of word order. This issue can stem from either not knowing a grammatical rule or difficulty in recognizing which rule applies, as exemplified by a complex 'center embedding' sentence.

Understanding a sentence requires combining vocabulary and grammar with the specific context in which it's used. This field is called pragmatics. Examples like 'crack the window' and 'I could sleep for a week' show how context and cultural knowledge (idioms, implicit information) are crucial for correct interpretation. Learners often lack this extensive contextual bank, making interpretation difficult.

To overcome these challenges, the speaker recommends both study and immersion. Study helps with memorizing word meanings and grammar rules. However, immersion, which involves extensive listening and reading in the target language, is essential for developing the intuitive ability to determine correct word meanings, grammatical structures, and utilize context.

Immersion allows learners to encounter comprehensible input—sentences they understand but that also contain new, unmastered elements. This process, explained by Stephen Krashen's Input Hypothesis, gradually pushes the learner's intuitive language ability forward. The progress is often subtle and incremental, making it feel like little is being learned, but it's crucial for synthesizing existing knowledge with new information.

When a sentence is not fully understood, despite knowing all its words, it means the sentence is above the learner's current intuitive level. Instead of getting fixated on it, the best approach is to 'let it go' and continue consuming content to find sentences that are within reach, thus incrementally building intuitive understanding. It is those comprehensible sentences that provide the most valuable learning experiences.