W1-S-1.21
Key Structure: past modal: “must have been…+ age”
1: Explanation of the advanced structure “must have been” used with age (eg I must have been about 7 or 8 years old) and how to use it in Part 1
Key Structure: past modal: “must have been…+ age”
1: Explanation of the advanced structure “must have been” used with age (eg I must have been about 7 or 8 years old) and how to use it in Part 1