1) "Fifty pounds is too much to pay for a T-shirt" - In this sentence, "is" is used because "fifty pounds" is considered as a singular amount of money.
2) "These trousers are too tight" - In this sentence, "are" is used because "these trousers" is a plural subject, referring to multiple trousers.
1) "Fifty pounds is too much to pay for a T-shirt" - In this sentence, "is" is used because "fifty pounds" is considered as a singular amount of money.
2) "These trousers are too tight" - In this sentence, "are" is used because "these trousers" is a plural subject, referring to multiple trousers.