Among which of the following sentences would an ESL learner first acquire English morphemes?

To determine which sentences an ESL (English as a Second Language) learner might first acquire English morphemes, it is important to consider the complexity of the sentences, the frequency and familiarity of the morphemes used, and the contextual clues that might aid in understanding.

Morphemes are the smallest units of meaning in a language, which can include prefixes, suffixes, roots, and entire words. ESL learners typically begin with simple, high-frequency morphemes in their learning process.

For instance:

1. Simple sentences with one clause: These sentences often contain basic subject-verb-object structures, which are easier to comprehend. For example, "She eats an apple."
2. Common regular and irregular verbs: Sentences using commonly taught verbs in their base form or past tense can also serve as early morpheme acquisition points, such as "He walked to the store."
3. Noun plurals and possessives: Basic constructs like adding -s for plural forms or -'s for possessive cases can be acquired early, such as "The dogs bark" or "John's book."

In conclusion, ESL learners will likely first acquire morphemes from simple, frequent, and contextually rich sentences. These foundational morphemes play a crucial role in building their understanding of English grammar and vocabulary.