buchou to watashi no iken ga itchishimashita.

The manager and I had the same opinion.

Breakdown of buchou to watashi no iken ga itchishimashita.

• 私わたし: I
• と: noun-connector particle
• が: subject particle
• の: possessive case particle

Questions & Answers about buchou to watashi no iken ga itchishimashita.

How should I break this sentence apart?

A natural way to parse it is:

• 部長と私の意見 = the manager's and my opinions
• が = subject marker
• 一致しました = matched / came into agreement

So the basic structure is:

[The manager's and my opinions] + [matched].

A more literal grammar view is [部長と私]の意見, where 部長と私 means the manager and I, and の links that whole group to 意見.

Why is と used after 部長?

Here と connects two nouns and means and.

So:

• 部長と私 = the manager and I

This is one of the most common uses of と.

Be careful: と can also mean with, depending on the sentence, but in this sentence it is simply joining two nouns.

Why is there only one の? Why not something like 部長の意見と私の意見?