Here's the answer:
“我每天坐地铁上学”
(wǒ měi tiān zùo dìtiě shàngxué)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- wǒ měitiān zuò dìtiě shàngxué
- wǒ měi tiān zuò dì tiě shàng xué
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 95.54% of the time!