一般来说,不可数名词作主语,谓语动词是用单数的。但是也有特殊与例外,现附上几种情况:1.表示具体重量的不可数名词作主语时,谓语动词通常用复数。如:More than 250tons of oranges are expected to be harvested this year in the county. 这个县今年可望收获250多吨柑桔。Over 150,000 tons of waste are dumped annually along the coastline. 每年有150,000多吨垃圾被倒在海岸线上。2.但有时也用单数(被视为整体来考虑)。如:There was tons of material to go through.This two kilograms of meat is enough for ten persons.