回答
-
"He patted his friend lightly on the shoulder to remove some dust from his clothes."
この場合には "dab" は合わないです。それより "pat" や "tap" 、"brush" を使えます。
"He patted his friend lightly on the shoulder to remove some dust from his clothes."
"he" 「彼」
"patted ~" 「〜叩いて」"tapped" や "brushed" もつかえます。
"his friend" 「彼の友人」
"lightly" 「軽く」
"on the shoulder" 「肩に」
"to remove ~" 「〜落とす」
"some dust" 「埃」
"from his clothes" 「友人の衣装から」