Please check your homework before handing it in!中hand为什么用ing形式

please check your inbox. Please double-check your year of birth Connection failed.please check your network. please check your network and trylater是什么意思 please you check your installed components please check your network and try later Your email entries must match.Please check Your account has not been activated.Please check your e error please check your internet connection anderrorplease check your internet connection and try again!.什么意思 Your certificate number is incorrect.Please check it 开机时显示please check your video 怎么处理? please check your network connection and the environment是什么意思 Please check your text messages and enter the code below: scanner not! please check your cable or paver connctions是什么意思 please check if you have loaded ammos on your ship Username not found, please check your spelling! 是什么意思 Please remit the amount of your bill by check. failed to create file.please check your proivilege是什么意思?