how is it gong后加in these day还是加during these day

how is it gong后加in these day还是加during these day these day还是these days How is your father these day怎么回答 Hi dear,how is ur day?How is the weather?Busy these days?I c christmas day 前面加on还是in this is 后加"a pen "还是"pen ",为什么"this is paper"可以不加?"these are these或those后加可数名词还是不可数名词 these/those后加可数名词还是不可数名词? it is sunny these days.it is a good idea to have a day o 首字母 it is riany these day同义句：It is _____these days填一词 All of these 后面加 are 还是 is?比如说All of these are about love. it‘s a nice day ,isn’t it?Yes it is.what are you gong in to