メアリーは背が高い。

メアリーは背が高い。

Mary is tall.

メアリーは背(せ)が高(たか)い。

Meari- wa se ga takai.

は (は)

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

背 (せい)

height; stature

が (が)

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

高い (たかい)

high; tall; expensive

Readings: ハイ、せ、せい、そむ.く、そむ.ける

Meanings: stature, height, back, behind, disobey, defy, go back on, rebel

Readings: コウ、たか.い、たか、 -だか、たか.まる、たか.める

Meanings: tall, high, expensive