5. Nei Armstrogwalked on the moon in 1969.Nobody had done this before him. (the first) Neil Armstrong was .......................

5. Neil Armstrong walked on the moon in 1969. Nobody had done this before him.

(the first) Neil Armstrong was the first person to walk on the moon in 1969.

Grammar Quick Check

Remember the formula we have been using: Subject + be + the first/last/only + noun + to-infinitive.

Noun: usually "person," "student," "man," etc.

To-infinitive: the action verb in its base form (e.g., to leave, to arrive, to pass, to walk).

Why use this instead of "who"?

While you could say "Neil Armstrong was the first person who walked on the moon," using the to-infinitive is:

More concise: It cuts out unnecessary words like "who" or "that."

More formal: It is the preferred style in academic and professional writing when describing records or unique achievements.

Would you like me to create a short quiz with 3 similar sentences so you can practice this grammar point one last time?