私はテニスが得意だ。

私はテニスが得意だ。

I'm good at tennis.

私(わたし)はテニスが得意(とくい)だ。

Watashi wa tenisu ga tokui da.

私 (わたし、わたくし)

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

は (は)

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

テニス (テニス)

tennis

が (が)

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

得意 (とくい)

triumph; prosperity; pride; one's strong point; one's forte; one's specialty; frequent customer (client, etc.)

だ (だ)

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

Readings: シ、わたくし、わたし

Meanings: private, I, me

Readings: トク、え.る、う.る

Meanings: gain, get, find, earn, acquire, can, may, able to, profit, advantage, benefit

Reading: イ

Meanings: idea, mind, heart, taste, thought, desire, care, liking