この書斎は客間兼用だ。

この書斎は客間兼用だ。

I also use this study for receiving guests.

この書斎(しょさい)は客間(きゃくま)兼用(けんよう)だ。

Kono shosai wa kyakuma ken'yō da.

此の (この)

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

書斎 (しょさい)

study; library; den; home office; reading room

は (は)

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

客間 (きゃくま)

parlor; parlour; guest room

兼用 (けんよう)

multi-use; combined use; combination; serving two purposes

だ (だ)

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

Readings: ショ、か.く、 -が.き、 -がき

Meaning: write

Readings: サイ、とき、つつし.む、ものいみ、い.む、いわ.う、いつ.く

Meanings: purification, Buddhist food, room, worship, avoid, alike

Readings: キャク、カク

Meanings: guest, visitor, customer, client

Readings: カン、ケン、あいだ、ま、あい

Meanings: interval, space

Readings: ケン、か.ねる、 -か.ねる

Meanings: concurrently, and, beforehand, in advance

Readings: ヨウ、もち.いる

Meanings: utilize, business, service, use, employ