"in summer" is also correct. "We do not go to school in summer" should be accepted. Reported on Nov. 19, 2017.
"we don't go to school in summer" is what I had also. Agree it should be accepted
during the summer, we do not attend school should be accepted (jan 4th 2018)
Why is 夏 by itself summer but we still have to write 夏天 ?
Last question ”这里在冬天下雪吗“ uses 在 before the season. Can this be omitted as is the case for this question?