祖父はひとりでいると、ときどき独り言を言う。

Sentence Analyzer

祖父 ひとり いる ときどき 独り言 言う

English Translation

My grandfather sometimes talks to himself when he is alone.

Furigana

祖父(そふ)はひとりでいると、ときどき(ひと)(ごと)()う。

Romanji

Sofu wa hitori de iru to, tokidoki hitorigoto o iu.

Words

祖父 (そふ、じじ、じい、おおじ、おじ、そぶ)
grandfather; old man; kyogen mask used for the role of an old man
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
一人 (ひとり、いちにん)
one person; alone; unmarried; solitary
(で、にて)
indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.
要る (いる)
to need; to want
()
if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
時々 (ときどき)
sometimes; at times
独り言 (ひとりごと)
soliloquy; monologue; speaking to oneself
()
indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.
言う (いう、ゆう)
to say; to utter; to declare; to name; to call; to go (e.g. "the alarm went ping"); to make a noise

Kanji

Reading: 
Meanings: ancestor, pioneer, founder
Readings: フ、 ちち
Meaning: father
Readings: ドク、 トク、 ひと.り
Meanings: single, alone, spontaneously, Germany
Readings: ゲン、 ゴン、 い.う、 こと
Meanings: say, word