my pen is blue ; my friends is

my pen is blue my friend is you 是This is my blue pen 还是This is my a blue pen 如何提问The blue pen is my favourite one 连词成句 is it my pen yellow and blue My pen and Eric's ruler is both blue. My pen is blue.怎样改成一般疑问句 My pen is blue.(改为否定句） This is my blue pen.(改为一般疑问句） Here is a letter from one of my pen friends. “my pen is blue,my friend is you”的中文意思是什么? My pen is green. "Where is my pen?"