08課 は・が 教科書 p.136
は / が
接続：Nは／Nが
distinguish between subject は and subject が. は set a theme or contrast; が identifies the subject, new information, or subordinate clause.
注意 / Note：Check the correct front form, subject and level of politeness; Don't just translate word for word.
比較 / Compare：Compare with structures in the same lesson to choose according to function in the whole sentence.
私は学生です。
I am a student.
だれが来ましたか。田中さんが来ました。
Who's coming? Tanaka has arrived.
象は鼻が長いです。
Elephants have long noses.