Help please 1.Lady Montagu introduced the smallpox inoculation to Europe. (add a prepositional phrase)

2.Children inoculated with cowpox taken from the breasts of cattle would not develop smallpox. (use first conditional)

3.There’s a man lying down on the pavement over there. Do you think he hurt himself? (use a suitable modal verb)

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?

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.

the second sentence is a great revision in my opinion. that would be a great topic.

explanation:

what makes a hero is someone who tries and acres and then heps to save people