Answer:
1). Lady Montagu introduced smallpox inoculation to Europe for preventing people's health.
2). If children inoculated with cowpox taken from the breasts of the cattle, it would not develop.
3). There may be a man lying down on the pavement over there. May he hurt himself?
Step-by-step explanation:
A Prepositional Phrase is characterized as the phrase that begins with a preposition followed by its object along with any/or modifiers of the object. It primarily functions to add detail about a verb or a noun. The First conditional phrase begins with 'if' and helps in indicating the events that may happen in the future. While modals like 'may' help in showing the possibility of something to take place in future.