彼がいつ戻るか確かではない。

Sentence Analyzer

戻る 確か ない

English Translation

I am not sure when he will be back.

Furigana

(かれ)がいつ(もど)るか(たし)かではない。

Romanji

Kare ga i tsu modoru ka tashika de wa nai.

Words

(かれ)
he; him; his; boyfriend
()
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
居る (いる)
to be (of animate objects); to exist; to stay; (after the -te form of a verb) verb indicating continuing action or state (i.e. to be ..ing, to have been ..ing)
()
indicates two contrasting actions; indicates possessive (often found in place names and compound words)
戻る (もどる)
to turn back (e.g. half-way); to return; to go back; to recover (e.g. something lost); to be returned; to rebound; to spring back
()
indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way
確か (たしか)
sure; certain; positive; definite; reliable; trustworthy; safe; sound; firm; accurate; correct; exact; If I'm not mistaken; If I remember correctly; If I remember rightly
()
be; is; indicates past or completed action; indicates light imperative
()
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
ない (ない)
not; emphatic suffix

Kanji

Readings: ヒ、 かれ、 かの、 か.の
Meanings: he, that, the
Readings: レイ、 もど.す、 もど.る
Meanings: re-, return, revert, resume, restore, go backwards
Readings: カク、 コウ、 たし.か、 たし.かめる
Meanings: assurance, firm, tight, hard, solid, confirm, clear, evident