求助英语词义的理解.”we become best friends"句子中,best为什么不加the,加the和不加th

求助英语词义的理解.”we become best friends"句子中,best为什么不加the,加the和不加th we will ba best friend为什么不加the best最高级前面为什么不加the I like English best ,best前为什么不加 the I like basketball best.Best前为什么不加the? it is best to exercise twice a week中 best 为什么不加the Which animal do you like best?为什么best的前面不加the Put the picture where light is best这里BEST为什么不加THE呢 we soon become best friends.中best是最高级,为什么前没加the which do you like best?为什么best之前不加the? Bill sings best in our class为什么best不加 the the best things in life are happy中的thing 加还是不加S,为什么?