There are four people in my family.people不是不可数名词吗,怎么能加four?此处换成person行吗

There are four words.翻译 there are four seasons in a year.用four提问 there are four season in the year. four画线提问 There are four apples in the box.对four提问 there are four room in my house 对four提问 ------classes are there in Grade Four?Four.填空 There are four stickers in my book对four提问 There are four people in his There are four people in my There are four s______ in a year. there are twenty -four ---in a day there are four candidates for this job. There are four s() in a year There are four windows ( )the two doors. There are four people in front of There are four r_____ in my house. there are four q____ in an hour. four,there,beside,are,are,umbrellas,windows,the造