can't

See:

Beggars can't be choosers. can't be arsed someone can't be bothered to do something can't believe your ears can't boil an egg can't complain can't cut the mustard can't do something for nuts can't for the life of me can't do something for toffee can't hear yourself think can't help something someone/something can't hold a candle to someone/something else

can't hold a candle to someone/something can't hold their drink/liquor can't keep your hands off someone can't make head nor/or tail of something can't put a foot wrong can't see beyond/past the end of your nose can't see the wood for the trees can't stand/take the pace can't take/keep your eyes off someone/something can't tell your arse from your elbow can't think straight can't do something to save your life I can't put a name to her/him.

I/You can't say fairer than that. If you can't beat 'em, (join 'em)! If you can't stand the heat, get out of the kitchen. A leopard can't/doesn't change its spots. You can't judge a book by its cover. You can't keep a good man/woman down. You can't make a silk purse out of a sow's ear. You can't make an omelette without breaking eggs. You can't make bricks without straw. you can't miss it You can't teach an old dog new tricks. You can't win 'em all.