The sky looks blue.为什么looks要加s?

When_____________,the sky looks dark blue The Sky Looks So Blue As My The sky looks blue.为什么looks要加s? The sky is blue THE BLUE SKY怎么样 against the blue sky The sun is shining in the blue sky while my inamorato heart looks The sun is shining in the blue sky while my inamorato heart looks into 图 英语翻译The sun is shining in the blue sky while my inamorato heart looks into the red flag looks very bright____the blue sky A 、in B 、against 要理由 Under the Blue Sky这篇课文英语翻译为中文 blue in the sky blue in your the sky usually looks blue.but if you went to the top of the highest mountain（阅读理解） the sky,blue as it The sky is light blue what the sky is blue THE SKY IS BLUE怎么样 why the sky is blue?