Мой друг прилетел в Москву вчера утром.

the friend

Breakdown of Мой друг прилетел в Москву вчера утром.

• мой: my
• в: to
• вчера: yesterday

Questions & Answers about Мой друг прилетел в Москву вчера утром.

Why is it мой друг and not моя друг?

Because друг is a masculine singular noun, and the possessive мой has to agree with it.

• masculine: мой
• feminine: моя
• neuter: моё
• plural: мои

So:

• мой друг = my male friend
• моя подруга = my female friend

Why is друг in its basic form here?

Because друг is the subject of the sentence, so it is in the nominative case, which is the dictionary form.

In this sentence, мой друг is the person who performed the action, so nominative is exactly what you expect.

What does прилетел mean exactly?

Прилетел means arrived by flying or flew in.

It comes from the verb прилететь, which is built from:

• лететь = to fly
• prefix при- = arrival, coming to a destination

So прилетел в Москву is not just flew in a general sense. It specifically means he arrived in Moscow by plane / by air.