In this lesson, you'll explore how families used to be and how they are now. You will

• read about the changing size of families
• consider how things used to be compared to how they are now
• learn numbers 30–99 in order to talk about ages and decades
• learn numbers 200–1999 in order to talk about dates and centuries
• begin to use the imperfect tense
• learn to make comparisons of equality
• learn to use the progressive with estar