2 fixed grammar
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This is not secure. Because accidently, because other user will know about othersothers' password accidently. If a password is auto generategenerated by the computer and userusers can't change it then it is secure. And the system havehas to change and inform about a new password after 5 or 10 loginlogins.  

This is not secure. Because accidently other user will know about others password. If password is auto generate by computer and user can't change it then it is secure. And system have to change and inform new password after 5 or 10 login.  

This is not secure, because other user will know about others' password accidently. If a password is auto generated by the computer and users can't change it then it is secure. And the system has to change and inform about a new password after 5 or 10 logins.

1
source | link

This is not secure. Because accidently other user will know about others password. If password is auto generate by computer and user can't change it then it is secure. And system have to change and inform new password after 5 or 10 login.