You can't be serious!
((略式))冗談だろ
You can't be too careful.
((略式))いくら気をつけても気をつけすぎることはない
You can't beat bungee jumping for excitement.
バンジージャンプほど興奮させられるものはない
You can't break (down) his spirit.
彼の決意をくじくことはできない
You can't judge a book by its cover.
((諺))人はうわべだけでは判断できない
You can't lift the piano alone.
ひとりではピアノは運べません
You can't make an omelet(te) without breaking eggs.
((諺))卵を割らなければオムレツはできない；犠牲は目的達成にはつきもの
You can't miss it.
((略式))（道などを教えて）すぐ目につくよ
You can't play tennis here.
ここでテニスをしてはいけない（◆軽い禁止；may notより好まれる）
You can't rely on his assistance.
彼の援助は当てにできないよ
