あそこにいるのはタケル君（くん）____。

明日（あした）は晴（は）れる____。

今日（きょう）は雨（あめ）が降（ふ）る____。

すぐ冷房（れいぼう）をつけてくれない____。

ここで食（た）べてもいい____。

納豆（なっとう）は変（へん）な匂（にお）いがするから、食（た）べれる____。

あまり理解（りかい）出来（でき）ていないみたい。行（い）ける____。

締（し）め切（き）りまでに出（だ）せる____。

皆（みんな）が言（い）うように魚（さかな）みたいに泳（およ）げる____。

お父（とう）さんは何時（なんじ）ごろ帰（かえ）ってくる____。

彼（かれ）が犯人（はんにん）だったら、どうなる____。

彼（かれ）は飛（と）ぶのが怖（こわ）いので、飛行機（ひこうき）に乗（の）れる____。

暑（あつ）いよ。冷房（れいぼう）を入（い）れていい____。

彼（かれ）はイケメンだし、頭（あたま）がいいし、悪（わる）いところがある____。

観光客（かんこうきゃく）がこれ以上（いじょう）くる____。

Originally, かしら was an abbreviation of か知（し）らぬ, or かしらん, which are both ways of expressing 'whether it's (A), I don't know'. These days, かしら is a standalone sentence ending particle that works in a similar way to かも, by expressing the speaker's uncertainty about the previous statement.

かしら may be attached to the end of almost any phrase that the speaker wants to express doubt about.

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<section class='caution'><h4>Caution</h4>
Although the original forms of か知（し）らぬ, or かしらん were useable by anybody, かしら is thought to be very feminine in modern Japanese, and therefore is not often used by men.</section>

Quick question: how does かしら work with -ます form, if it’s compatible? I didn’t see any example sentences showing that?

Brand S

In theory, it can be used with -ます or です in the same way as かな, just put it at the end. But both かしら and かな aren’t really used with people one needs to be polite with. In polite speech, it would be でしょうか instead.
In the forum post there’s still a “casual feminine speech” tag, somehow the “casual” part was lost when the grammar point got its new explanation.

かしらI wonder

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