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年下， としした

1. younger, junior

tbd

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妹， いもうと

1. younger sister

妹妹

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题

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で

1. at, in 2. at, when 3. by, with 4. within, in 5. and then, so 6. and, then 7. let me tell you, don't you know

表示范围

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弟， おとうと， てい

1. younger brother, little brother, kid brother 2. brother-in-law (spouse's younger brother or younger sister's husband) 3. pupil, apprentice

弟弟，小弟，小兄弟；姐夫/妹夫（配偶的弟弟或妹妹的丈夫）；学生，学徒

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です

1. be, is

断定助动词，是，是也

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