check emails还是check email?

check emails还是check email? Check CHECK 是check luggage还是check in luggage还是check for luggage check in和check 蓝色格子英语怎么说?PS ：用check这个单词(是bulue check,还是check blue?) I often use it to ___ emails.在borrow,play,check,talk中选 check it check it check it check out check it check up check in check out check up check with check.是什么意思? check in check in check out