ten minutes是单数还是复数?

ten minutes是单数还是复数? ten minutes视为单数还是复数?RT Seven out of ten 是单数还是复数 feet作英寸时是单数还是复数?ten feet还是ten feets请说明原因， 请问英文十分钟是:ten minutes 还是ten-minutes 到底是ten minutes wait还是ten minutes waiting? another ten students后面的动词是用单数还是复数?thanks minutes做主语,谓语动词用单数还是复数 ten dollars谓语动词用单数还是复数? Parents是单数还是复数是单数还是复数(简练) ten minutes“walk还是ten minutes walk ''people''是复数还是单数? clothes是单数还是复数? weather是单数还是复数 chocolate是单数还是复数? family是单数还是复数 people是复数还是单数? people是单数还是复数?