あなたはプロだが私はアマチュアだ。

あなたはぷろだが私はアマチュアだ。

You are a professional, but I am an amateur.

あなたはプロだが私(わたし)はアマチュアだ。

Anata wa puro da ga watashi wa amachua da.

貴方 (あなた)

you (referring to someone of equal or lower status); dear (what a wife calls a husband)

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

プロ (プロ)

professional

だ (だ)

be; is; indicates past or completed action; indicates light imperative

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

私 (わたし、わたくし)

I; me; private affairs; personal matter; secrecy; selfishness

アマチュア (アマチュア)

amateur

Readings: シ、わたくし、わたし

Meanings: private, I, me