Final answer:
Children generally begin forming two-word sentences between 18 to 24 months old, which is a critical period for language development and expressing more complex ideas. option 4
Step-by-step explanation:
A child typically starts to create two-word sentences at the age of 18 to 24 months. This period in a child’s development is when they begin to combine their expanding vocabulary—which may range from 50 to around 200 words—into more complex expressions that can communicate more detailed thoughts and needs beyond single-word utterances. For example, a child may start saying “more juice” instead of just “juice” to indicate they want another serving. By the age of 2, during this interactive phase of language development, toddlers not only refine their speaking skills but also begin to understand simple verbal commands and use words to express independence, often showing attachment to parents and experiencing separation anxiety.